---
id: CVE-2026-5121
title: A flaw was found in libarchive
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 t…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-190
  - CWE-190
vendor: libarchive
product: libarchive
affected:
  - libarchive
  - hardened_images
  - openshift_container_platform = 4.0
  - enterprise_linux = 6.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
published: '2026-03-30'
updated: '2026-09-01'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5121'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:10065'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:10097'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:11768'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:12071'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:12274'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:13812'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14773'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14937'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:15087'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:16008'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:16009'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:16030'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:16174'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:17596'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:19724'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:19725'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:20040'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:21690'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:25096'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8510'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8517'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8521'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8534'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8864'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8866'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8867'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8873'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8908'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:8944'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:9026'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:9592'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:9832'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-5121'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2452945'
    label: secalert@redhat.com
  - url: 'https://github.com/advisories/GHSA-2vwv-vqpv-v8vc'
    label: secalert@redhat.com
  - url: 'https://github.com/libarchive/libarchive/pull/2934'
    label: secalert@redhat.com
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-585531.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.01073
epssPercentile: 0.63485
ingestedAt: '2026-09-01T14:27:54.391Z'
---

## Overview

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.

## Affected

- `libarchive`
- `hardened_images`
- `openshift_container_platform = 4.0`
- `enterprise_linux = 6.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.