BlackTreeIndependent security intelligence
← Back to the CVE catalogue
Full vulnerability report · 2026
CVE-2026-5121High confidence

Libarchive: libarchive: arbitrary code execution via integer overflow in iso9660 image processing

Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support

7.5HighCVSS 3.1
Recommended action
Within 7 days

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

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
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.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivelibarchiveVendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.3.7.2-2ubuntu0.7Canonical record ↗Source updated 9 Sept 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-2026-5121 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitylibarchive: libarchive: Arbitrary code execution via integer overflow in ISO9660 image processing
8 under investigation

The vendor has not yet reached a final affected or unaffected determination for these products.

  • bsdtar as a component of Red Hat Enterprise Linux 10
  • libarchive as a component of Red Hat Enterprise Linux 10
  • libarchive-devel as a component of Red Hat Enterprise Linux 10
  • libarchive.src as a component of Red Hat Enterprise Linux 10
  • libarchive as a component of Red Hat Enterprise Linux 6
  • libarchive-devel as a component of Red Hat Enterprise Linux 6
  • libarchive.src as a component of Red Hat Enterprise Linux 6
  • openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4
Summary
A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.
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
SSA-585531 · CSAF 2.0 · revision 1 · interimSiemens ProductCERTSSA-585531: Multiple Vulnerabilities in SIDIS Secured SmartPlug before V7.26.0310
1 known affected

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

  • SIDIS Secured SmartPlug < V7.26.0310
Summary
A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.
Remediation
Update to V7.26.0310 or later version
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2026-17073

No EUVD known-exploited evidence

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

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
7.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

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

Patch available
01

What, why and how

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

What

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

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 → Integer Overflow or Wraparound → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
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-190 ↗

CWE-190: Integer Overflow or Wraparound. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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:N/S:U/C:H/I:N/A:N

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.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkUnauthenticatedRemote code executionCWE-190
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-17073Official EUVD mapping

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

Official EUVD record
BSI · German · WID-SEC-W-2026-1666IBM QRadar SIEM: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory
BSI · German · WID-SEC-W-2026-0923libarchive: Schwachstelle ermöglicht Codeausführung

Ein entfernter Angreifer kann eine Schwachstelle in libarchive ausnutzen, um beliebigen Programmcode auszuführen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0667Multiples vulnérabilités dans les produits IBM

e.org/CVERecord?id=CVE-2026-41044 Référence CVE CVE-2026-41324 https://www.cve.org/CVERecord?id=CVE-2026-41324 Référence CVE CVE-2026-4424 https://www.cve.org/CVERecord?id=CVE-2026-4424 Référence CVE CVE-2026-4519 https://www.cve.org/CVERecord?id=CVE-2026-4519 Référence CVE CVE-2026-4786 https://www.cve.org/CVERecord?id=CVE-2026-4786 Référence CVE CVE-2026-4800 https://www.cve.org/CVERecord?id=CVE-2026-4800 Référence CVE CVE-2026-4867 https://www.cve.org/CVERecord?id=CVE-2026-4867 Référence CVE CVE-2026-4923 https://www.cve.org/CVERecord?id=CVE-2026-4923 Référence CVE CVE-2026-4926 https://www.cve.org/CVERecord?id=CVE-2026-4926 Référence CVE CVE-2026-5121 https://www.cve.org/CVERecord?id=CVE-2026-5121 Référence CVE CVE-2026-5598 https://www.cve.org/CVERecord?id=CVE-2026-5598 Référence CVE CVE-2026-5795 https://www.cve.org/CVERecord?id=CVE-2026-5795 Référence CVE CVE-2026-6100 https://www.cve.org/CVERecord?id=CVE-2026-6100 Référence CVE CVE-2026-6918 https://www.cve.org/CVERecord?id=CVE-2026-6918 Référence CVE CVE-2026-8620 https://www.cve.org/CVERecord?id=CVE-2026-8620 Référence CVE CVE-2026-8633 https://www.cve.org/CVERecord?id=CVE-2026-8633 Gestion détaillée du document le 29 mai 2026 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0627Multiples vulnérabilités dans les produits Splunk

ecord?id=CVE-2026-40192 Référence CVE CVE-2026-40200 https://www.cve.org/CVERecord?id=CVE-2026-40200 Référence CVE CVE-2026-4111 https://www.cve.org/CVERecord?id=CVE-2026-4111 Référence CVE CVE-2026-41324 https://www.cve.org/CVERecord?id=CVE-2026-41324 Référence CVE CVE-2026-42308 https://www.cve.org/CVERecord?id=CVE-2026-42308 Référence CVE CVE-2026-42309 https://www.cve.org/CVERecord?id=CVE-2026-42309 Référence CVE CVE-2026-42310 https://www.cve.org/CVERecord?id=CVE-2026-42310 Référence CVE CVE-2026-42311 https://www.cve.org/CVERecord?id=CVE-2026-42311 Référence CVE CVE-2026-4424 https://www.cve.org/CVERecord?id=CVE-2026-4424 Référence CVE CVE-2026-5121 https://www.cve.org/CVERecord?id=CVE-2026-5121 Référence CVE CVE-2026-6042 https://www.cve.org/CVERecord?id=CVE-2026-6042 Gestion détaillée du document le 21 mai 2026 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact cyber.gouv.fr service-public.fr legifrance.gouv.fr info.gouv.fr france.fr info.gouv.fr/risques Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la sécurité des systèmes d'information

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0556Multiples vulnérabilités dans les produits VMware

e.org/CVERecord?id=CVE-2026-40192 Référence CVE CVE-2026-41066 https://www.cve.org/CVERecord?id=CVE-2026-41066 Référence CVE CVE-2026-4111 https://www.cve.org/CVERecord?id=CVE-2026-4111 Référence CVE CVE-2026-4224 https://www.cve.org/CVERecord?id=CVE-2026-4224 Référence CVE CVE-2026-4424 https://www.cve.org/CVERecord?id=CVE-2026-4424 Référence CVE CVE-2026-4519 https://www.cve.org/CVERecord?id=CVE-2026-4519 Référence CVE CVE-2026-4539 https://www.cve.org/CVERecord?id=CVE-2026-4539 Référence CVE CVE-2026-4786 https://www.cve.org/CVERecord?id=CVE-2026-4786 Référence CVE CVE-2026-4878 https://www.cve.org/CVERecord?id=CVE-2026-4878 Référence CVE CVE-2026-5121 https://www.cve.org/CVERecord?id=CVE-2026-5121 Référence CVE CVE-2026-5598 https://www.cve.org/CVERecord?id=CVE-2026-5598 Référence CVE CVE-2026-6100 https://www.cve.org/CVERecord?id=CVE-2026-6100 Gestion détaillée du document le 11 mai 2026 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact cyber.gouv.fr service-public.fr legifrance.gouv.fr info.gouv.fr france.fr info.gouv.fr/risques Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la sécurité des systèmes d'information

Official advisory
NCSC-NL · Dutch · NCSC-2026-0229Kwetsbaarheden verholpen in Siemens producten

Multiple vulnerabilities in libarchive, including an integer overflow in ISO9660 image processing on 32-bit systems, can lead to heap buffer overflows and arbitrary code execution, alongside issues causing denial of service and information disclosure in RAR archive handling.

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
libarchive-0:3.1.2-14.el7_9.2.i686 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-0:3.1.2-14.el7_9.2.ppc as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-0:3.1.2-14.el7_9.2.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-0:3.1.2-14.el7_9.2.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-0:3.1.2-14.el7_9.2.s390 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-0:3.1.2-14.el7_9.2.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-0:3.1.2-14.el7_9.2.src as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-0:3.1.2-14.el7_9.2.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.i686 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.ppc as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.s390 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS); bsdcpio-0:3.1.2-14.el7_9.2.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); bsdcpio-0:3.1.2-14.el7_9.2.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); bsdcpio-0:3.1.2-14.el7_9.2.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); bsdcpio-0:3.1.2-14.el7_9.2.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); bsdtar-0:3.1.2-14.el7_9.2.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); bsdtar-0:3.1.2-14.el7_9.2.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); bsdtar-0:3.1.2-14.el7_9.2.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); bsdtar-0:3.1.2-14.el7_9.2.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.i686 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.ppc as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.s390 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); libarchive-debuginfo-0:3.1.2-14.el7_9.2.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS); and 582 more
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
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.
04

Evidence and provenance

Published 30 Mar 2026 · Last source change 1 Sept 2026, 08:38 UTC · CWE-190 · Integer Overflow or Wraparound

CVE recordCVE.org · 5.2
CVSS sourceCNA
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-2026-17073
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

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-2026-17073↗Vendor CSAF · Red Hat Product Security↗Patch or update reference↗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-2026-5121 · cve.blacktree.nl