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Full vulnerability report · 2026
CVE-2026-109708High confidence

Sandbox escape due to incorrect boundary conditions in the Networking component

Mozilla · Firefox

9.6CriticalCVSS 3.1
Recommended action
Within 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.33% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Mozilla Firefox and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

11 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.153.5.0esr-1~deb13u1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian trixietrixie · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.5.1esr-1~deb13u1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian bookwormbookworm · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.153.5.0esr-1~deb12u1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian bookwormbookworm · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.5.1esr-1~deb12u1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian forkyforky · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.153.5.0esr-1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian forkyforky · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.5.0esr-1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian sidsid · sourcefirefoxVendor fix publishedDebian records a fixed source-package version for this release.158.0-1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian sidsid · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.153.5.0esr-1Debian Security Tracker ↗Source updated 4 Nov 2026
Debian sidsid · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:153.5.0esr-1Debian Security Tracker ↗Source updated 4 Nov 2026
Ubuntu 24.04 LTSnoble · standard archivemozjs102Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 4 Nov 2026
Ubuntu 24.04 LTSnoble · standard archivemozjs115Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 4 Nov 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2026-109708 · CSAF 2.0 · revision 8 · interimSUSE Product Security TeamCVE-2026-109708
165 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • MozillaFirefox as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1
Summary
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-109708 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityfirefox: Sandbox escape due to incorrect boundary conditions in the Networking component
7 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • rhel10/thunderbird-flatpak as a component of Red Hat Enterprise Linux 10
  • thunderbird as a component of Red Hat Enterprise Linux 10
  • thunderbird.src as a component of Red Hat Enterprise Linux 10
  • firefox as a component of Red Hat Enterprise Linux 7
  • firefox.src as a component of Red Hat Enterprise Linux 7
  • thunderbird as a component of Red Hat Enterprise Linux 8
  • thunderbird.src as a component of Red Hat Enterprise Linux 8
Summary
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to incorrect boundary conditions in the Networking component
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-98485

No EUVD known-exploited evidence

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
9.6 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

What

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

Why

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

Why

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Restriction of Operations within the Bounds of a Memory Buffer → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-119 ↗

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer. The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-119
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-98485Official EUVD mapping

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

Official EUVD record ↗
BSI · German · WID-SEC-2026-4216Mozilla Firefox, Firefox ESR, und Thunderbird: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox, Mozilla Firefox ESR und Mozilla Thunderbird ausnutzen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2026-3942Mozilla Firefox und Thunderbrid: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox und Mozilla Thunderbrid ausnutzen, um seine Privilegien zu erhöhen, Sicherheitsmaßnahmen zu umgehen, Spoofing-Angriffe durchzuführen, Daten offenzulegen oder zu manipulieren, Denial-of-Service-Zustände zu verursachen oder andere, nicht näher spezifizierte Angriffe durchzuführen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1406Avis du CERT-FR

dvisories/mfsa2026-119/ Bulletin de sécurité Mozilla mfsa2026-120 du 27 octobre 2026 https://www.mozilla.org/en-US/security/advisories/mfsa2026-120/ Bulletin de sécurité Mozilla mfsa2026-121 du 27 octobre 2026 https://www.mozilla.org/en-US/security/advisories/mfsa2026-121/ Bulletin de sécurité Mozilla mfsa2026-122 du 27 octobre 2026 https://www.mozilla.org/en-US/security/advisories/mfsa2026-122/ Référence CVE CVE-2026-100801 https://www.cve.org/CVERecord?id=CVE-2026-100801 Référence CVE CVE-2026-109705 https://www.cve.org/CVERecord?id=CVE-2026-109705 Référence CVE CVE-2026-109707 https://www.cve.org/CVERecord?id=CVE-2026-109707 Référence CVE CVE-2026-109708 https://www.cve.org/CVERecord?id=CVE-2026-109708 Référence CVE CVE-2026-110247 https://www.cve.org/CVERecord?id=CVE-2026-110247 Référence CVE CVE-2026-113869 https://www.cve.org/CVERecord?id=CVE-2026-113869 Référence CVE CVE-2026-117860 https://www.cve.org/CVERecord?id=CVE-2026-117860 Référence CVE CVE-2026-117861 https://www.cve.org/CVERecord?id=CVE-2026-117861 Référence CVE CVE-2026-117862 https://www.cve.org/CVERecord?id=CVE-2026-117862 Référence CVE CVE-2026-117863 https://www.cve.org/CVERecord?id=CVE-2026-117863 Référence CVE CVE-2026-117864 https://www.cve.org/CVERecord?id=CVE-2026-117864 Référence CVE CVE-2026-117865 https://www.cve.o

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1305Avis du CERT-FR

de sécurité Mozilla mfsa2026-109 du 13 octobre 2026 https://www.mozilla.org/en-US/security/advisories/mfsa2026-109/ Bulletin de sécurité Mozilla mfsa2026-110 du 13 octobre 2026 https://www.mozilla.org/en-US/security/advisories/mfsa2026-110/ Référence CVE CVE-2026-106016 https://www.cve.org/CVERecord?id=CVE-2026-106016 Référence CVE CVE-2026-109704 https://www.cve.org/CVERecord?id=CVE-2026-109704 Référence CVE CVE-2026-109705 https://www.cve.org/CVERecord?id=CVE-2026-109705 Référence CVE CVE-2026-109706 https://www.cve.org/CVERecord?id=CVE-2026-109706 Référence CVE CVE-2026-109707 https://www.cve.org/CVERecord?id=CVE-2026-109707 Référence CVE CVE-2026-109708 https://www.cve.org/CVERecord?id=CVE-2026-109708 Référence CVE CVE-2026-109709 https://www.cve.org/CVERecord?id=CVE-2026-109709 Référence CVE CVE-2026-109710 https://www.cve.org/CVERecord?id=CVE-2026-109710 Référence CVE CVE-2026-109711 https://www.cve.org/CVERecord?id=CVE-2026-109711 Référence CVE CVE-2026-109712 https://www.cve.org/CVERecord?id=CVE-2026-109712 Référence CVE CVE-2026-109713 https://www.cve.org/CVERecord?id=CVE-2026-109713 Référence CVE CVE-2026-109714 https://www.cve.org/CVERecord?id=CVE-2026-109714 Référence CVE CVE-2026-109715 https://www.cve.org/CVERecord?id=CVE-2026-109715 Référence CVE CVE-2026-109716 https://www.cve.o

Official advisory ↗
CSIRT Italia · Italian · risolte-vulnerabilita-in-prodotti-mozilla-14Risolte vulnerabilità in prodotti Mozilla

a - - CVE-2026-117873 : apre una nuova finestra - - CVE-2026-117872 : apre una nuova finestra - - CVE-2026-117871 : apre una nuova finestra - - CVE-2026-117870 : apre una nuova finestra - - CVE-2026-117869 : apre una nuova finestra - - CVE-2026-117868 : apre una nuova finestra - - CVE-2026-117867 : apre una nuova finestra - - CVE-2026-117866 : apre una nuova finestra - - CVE-2026-117865 : apre una nuova finestra - - CVE-2026-117864 : apre una nuova finestra - - CVE-2026-117863 : apre una nuova finestra - - CVE-2026-117862 : apre una nuova finestra - - CVE-2026-117861 : apre una nuova finestra - - CVE-2026-117860 : apre una nuova finestra - - CVE-2026-109708 : apre una nuova finestra - - CVE-2026-109707 : apre una nuova finestra - - CVE-2026-109705 : apre una nuova finestra - - Riferimenti (5) https://www.mozilla.org/en-US/security/advisories/mfsa2026-122/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-119/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-121/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-118/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-120/ Change log Titolo della tabella Versione Note Data 1.0 Pubblicato il 28-10-2026 28/10/2026 Impatto sistemico Alto (66.15) Argomenti Mozilla Firefox Firefox ESR Thunderbird Data pubblicazione

Official advisory ↗
CSIRT Italia · Italian · risolte-vulnerabilita-in-prodotti-mozilla-12Risolte vulnerabilità in prodotti Mozilla

VE-2026-109722 : apre una nuova finestra - - CVE-2026-109721 : apre una nuova finestra Presente - CVE-2026-109720 : apre una nuova finestra - - CVE-2026-109719 : apre una nuova finestra - - CVE-2026-109718 : apre una nuova finestra - - CVE-2026-109717 : apre una nuova finestra - - CVE-2026-109716 : apre una nuova finestra - - CVE-2026-109715 : apre una nuova finestra - - CVE-2026-109714 : apre una nuova finestra - - CVE-2026-109713 : apre una nuova finestra - - CVE-2026-109712 : apre una nuova finestra - - CVE-2026-109711 : apre una nuova finestra - - CVE-2026-109710 : apre una nuova finestra - - CVE-2026-109709 : apre una nuova finestra - - CVE-2026-109708 : apre una nuova finestra - - CVE-2026-109707 : apre una nuova finestra - - CVE-2026-109706 : apre una nuova finestra - - CVE-2026-109705 : apre una nuova finestra - - CVE-2026-109704 : apre una nuova finestra - - Riferimenti (5) https://www.mozilla.org/en-US/security/advisories/mfsa2026-106/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-107/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-108/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-109/ https://www.mozilla.org/en-US/security/advisories/mfsa2026-110/ Change log Titolo della tabella Versione Note Data 1.0 Pubblicato il 13-10-2026 13/10/2026 1.1 Aggi

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
Official vendor articles5 stored documents

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

  • Security Vulnerabilities fixed in Firefox ESR 115.44 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 3 Nov 2026Security Vulnerabilities fixed in Firefox ESR 115.44 Announced October 27, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 115.44 Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advisor
  • Security Vulnerabilities fixed in Firefox 158 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Oct 2026Security Vulnerabilities fixed in Firefox 158 Announced October 13, 2026 Impact high Products Firefox Fixed in Firefox 158 Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advisory for every indivi
  • Security Vulnerabilities fixed in Firefox ESR 153.5 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Oct 2026Security Vulnerabilities fixed in Firefox ESR 153.5 Announced October 13, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 153.5 Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advisory
  • Security Vulnerabilities fixed in Thunderbird 158 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Oct 2026Security Vulnerabilities fixed in Thunderbird 158 Announced October 13, 2026 Impact high Products Thunderbird Fixed in Thunderbird 158 Many of these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, however they may pose risks in browser or browse
  • Security Vulnerabilities fixed in Thunderbird 153.5 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Oct 2026Security Vulnerabilities fixed in Thunderbird 153.5 Announced October 13, 2026 Impact high Products Thunderbird Fixed in Thunderbird 153.5 Many of these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, however they may pose risks in browser or br
04

Evidence and provenance

Published 13 Oct 2026 · Last source change 27 Oct 2026, 14:05 UTC · CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-10-14
European sourceENISA EUVD · EUVD-2026-98485
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCISA ADP
NVD statusNVD not scheduled

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    rhel10/thunderbird-flatpak as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 9; thunderbird.src as a component of Red Hat Enterprise Linux 9 · Fixed: firefox-0:153.5.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.src as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.src as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); firefox-0:153.5.0-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); firefox-0:153.5.0-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); firefox-0:153.5.0-1.el9_8.src as a component of Red Hat Enterprise Linux AppStream (v. 9); and 13 more
    After
    rhel10/thunderbird-flatpak as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8 · Fixed: firefox-0:153.5.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.src as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debuginfo-0:153.5.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-debugsource-0:153.5.0-1.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); firefox-0:153.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.src as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debuginfo-0:153.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-debugsource-0:153.5.0-1.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); firefox-0:153.5.0-1.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); firefox-0:153.5.0-1.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); firefox-0:153.5.0-1.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); firefox-0:153.5.0-1.el9_8.src as a component of Red Hat Enterprise Linux AppStream (v. 9); and 26 more
    Red Hat Product Security ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151; removed remediation: mozilla.org/mfsa2026-119.
    Before
    remediation: mozilla.org/mfsa2026-119
    After
    remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151
    CNA ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added remediation: mozilla.org/mfsa2026-119; removed remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151.
    Before
    remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151
    After
    remediation: mozilla.org/mfsa2026-119
    CNA ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: Firefox: 153.5 ≤ 153.*, 158 ≤ *; Thunderbird: 153.5 ≤ 153.*, 158 ≤ *
    After
    See the vendor and CVE records for the affected range. · Fixed: Firefox: 115.44 ≤ 115.*, 153.5 ≤ 153.*, 158 ≤ *; Thunderbird: 153.5 ≤ 153.*, 158 ≤ *
    CNA ↗
  5. SeveritySeverity changed from Unknown to Critical.
    Before
    Unknown
    After
    Critical
    CISA ADP ↗
  6. CVSS scoreCVSS score changed from not recorded to 9.6 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H).
    Before
    not recorded
    After
    9.6 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H)
    CISA ADP ↗
  7. ENISA EUVD mappingEUVD-2026-98485 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-98485"}
    ENISA EUVD ↗
  8. Vendor guidanceAuthoritative vendor guidance changed: added remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151; removed remediation: mozilla.org/mfsa2026-109.
    Before
    remediation: mozilla.org/mfsa2026-109
    After
    remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151
    CNA ↗
  9. Vendor guidanceAuthoritative vendor guidance changed: added remediation: mozilla.org/mfsa2026-109; removed remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151.
    Before
    remediation: bugzilla.mozilla.org/show_bug.cgi?id=2059151
    After
    remediation: mozilla.org/mfsa2026-109
    CNA ↗
  10. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: Firefox: 153.5 ≤ 153.*, 158 ≤ *
    After
    See the vendor and CVE records for the affected range. · Fixed: Firefox: 153.5 ≤ 153.*, 158 ≤ *; Thunderbird: 153.5 ≤ 153.*, 158 ≤ *
    CNA ↗
  11. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-98485↗Vendor CSAF · SUSE Product Security Team↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-109708 · cve.blacktree.nl