BlackTreeCVE Intelligence
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Full vulnerability report · 2026
CVE-2026-12325High confidence

Denial-of-service in the Graphics: ImageLib component

Mozilla · Firefox

6.5MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.23% 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: As exposure requiresRemediation target: Within 365 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.140.12.0esr-1~deb13u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian trixietrixie · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:140.12.0esr-1~deb13u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.140.12.0esr-1~deb12u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:140.12.0esr-1~deb12u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.140.12.0esr-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:140.12.0esr-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcefirefoxVendor fix publishedDebian records a fixed source-package version for this release.152.0-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.140.12.0esr-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcethunderbirdVendor fix publishedDebian records a fixed source-package version for this release.1:140.12.0esr-1Debian Security Tracker ↗Source updated 6 Oct 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 5 Oct 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 5 Oct 2026
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-2026-37071

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

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
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

Denial-of-service in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

What

Denial-of-service in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Why

The product does not properly control the allocation and maintenance of a limited resource.

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

Denial-of-service in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Why

The product does not properly control the allocation and maintenance of a limited resource.

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 → Uncontrolled Resource Consumption → 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
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-400 ↗

CWE-400: Uncontrolled Resource Consumption. The product does not properly control the allocation and maintenance of a limited resource.

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:U/C:N/I:N/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.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.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-400
A

Official authority intelligence

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

BSI · German · WID-SEC-2026-1959Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox, Mozilla Firefox ESR und Mozilla Thunderbird ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Speicherbeschädigungen zu verursachen, Sicherheitsmaßnahmen zu umgehen und aus der Sandbox auszubrechen, vertrauliche Informationen offenzulegen, Daten zu manipulieren und Denial-of-Service-Zustände auszulösen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0764Multiples vulnérabilités dans les produits Mozilla

d?id=CVE-2026-12316 Référence CVE CVE-2026-12317 https://www.cve.org/CVERecord?id=CVE-2026-12317 Référence CVE CVE-2026-12318 https://www.cve.org/CVERecord?id=CVE-2026-12318 Référence CVE CVE-2026-12319 https://www.cve.org/CVERecord?id=CVE-2026-12319 Référence CVE CVE-2026-12320 https://www.cve.org/CVERecord?id=CVE-2026-12320 Référence CVE CVE-2026-12321 https://www.cve.org/CVERecord?id=CVE-2026-12321 Référence CVE CVE-2026-12322 https://www.cve.org/CVERecord?id=CVE-2026-12322 Référence CVE CVE-2026-12323 https://www.cve.org/CVERecord?id=CVE-2026-12323 Référence CVE CVE-2026-12324 https://www.cve.org/CVERecord?id=CVE-2026-12324 Référence CVE CVE-2026-12325 https://www.cve.org/CVERecord?id=CVE-2026-12325 Référence CVE CVE-2026-12326 https://www.cve.org/CVERecord?id=CVE-2026-12326 Référence CVE CVE-2026-12327 https://www.cve.org/CVERecord?id=CVE-2026-12327 Référence CVE CVE-2026-12328 https://www.cve.org/CVERecord?id=CVE-2026-12328 Référence CVE CVE-2026-12329 https://www.cve.org/CVERecord?id=CVE-2026-12329 Référence CVE CVE-2026-12330 https://www.cve.org/CVERecord?id=CVE-2026-12330 Référence CVE CVE-2026-53899 https://www.cve.org/CVERecord?id=CVE-2026-53899 Référence CVE CVE-2026-53900 https://www.cve.org/CVERecord?id=CVE-2026-53900 Gestion détaillée du document le 17 juin 2026 Version initiale

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-020422Mozilla FoundationのMozilla Firefox等の複数製品におけるリソースの枯渇に関する脆弱性

Graphics: ImageLib コンポーネントにおけるサービス拒否の脆弱性です。この脆弱性は Firefox 152、Firefox ESR 140.12、Firefox ESR 115.37、Thunderbird 152、および Thunderbird 140.12 で修正されました。

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
See the vendor and CVE records for the affected range.
Fixed
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
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 articles10 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 152 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox 152 Announced June 16, 2026 Impact high Products Firefox Fixed in Firefox 152 # CVE-2026-12289: Privilege escalation in the Graphics: WebRender component Reporter choeseyeong Impact high References Bug 2023443 # CVE-2026-12290: Memory safety bug fixed in Firefox 15
  • Security Vulnerabilities fixed in Thunderbird 152 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Thunderbird 152 Announced June 16, 2026 Impact high Products Thunderbird Fixed in Thunderbird 152 In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser
  • Security Vulnerabilities fixed in Thunderbird 140.12 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Thunderbird 140.12 Announced June 16, 2026 Impact high Products Thunderbird Fixed in Thunderbird 140.12 In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or b
  • Security Vulnerabilities fixed in Firefox ESR 140.12 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox ESR 140.12 Announced June 16, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 140.12 # CVE-2026-12289: Privilege escalation in the Graphics: WebRender component Reporter choeseyeong Impact high References Bug 2023443 # CVE-2026-12290: Memory safety bug f
  • Security Vulnerabilities fixed in Firefox ESR 115.37 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox ESR 115.37 Announced June 16, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 115.37 # CVE-2026-12289: Privilege escalation in the Graphics: WebRender component Reporter choeseyeong Impact high References Bug 2023443 # CVE-2026-12290: Memory safety bug f
  • Security Vulnerabilities fixed in Firefox 152 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox 152 Announced June 16, 2026 Impact high Products Firefox Fixed in Firefox 152 # CVE-2026-12289: Privilege escalation in the Graphics: WebRender component Reporter choeseyeong Impact high References Bug 2023443 # CVE-2026-12290: Memory safety bug fixed in Firefox 15
  • Security Vulnerabilities fixed in Thunderbird 152 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Thunderbird 152 Announced June 16, 2026 Impact high Products Thunderbird Fixed in Thunderbird 152 In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser
  • Security Vulnerabilities fixed in Thunderbird 140.12 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Thunderbird 140.12 Announced June 16, 2026 Impact high Products Thunderbird Fixed in Thunderbird 140.12 In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or b
  • Security Vulnerabilities fixed in Firefox ESR 140.12 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox ESR 140.12 Announced June 16, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 140.12 # CVE-2026-12289: Privilege escalation in the Graphics: WebRender component Reporter choeseyeong Impact high References Bug 2023443 # CVE-2026-12290: Memory safety bug f
  • Security Vulnerabilities fixed in Firefox ESR 115.37 — Mozilla →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Security Vulnerabilities fixed in Firefox ESR 115.37 Announced June 16, 2026 Impact high Products Firefox ESR Fixed in Firefox ESR 115.37 # CVE-2026-12289: Privilege escalation in the Graphics: WebRender component Reporter choeseyeong Impact high References Bug 2023443 # CVE-2026-12290: Memory safety bug f
04

Evidence and provenance

Published 16 Jun 2026 · Last source change 16 Jun 2026, 16:08 UTC · CWE-400 · Uncontrolled Resource Consumption

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 2026-08-14
European sourceENISA EUVD · EUVD-2026-37071
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCISA ADP
NVD statusNVD enriched

Missing structured fields: affected versions. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

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-2026-37071↗Vendor advisory↗Vendor advisory↗Vendor advisory↗Vendor advisory↗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-2026-12325 · cve.blacktree.nl