CVE-2026-5121Libarchive: libarchive: arbitrary code execution via integer overflow in iso9660 image processing

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

1.1% · top 34% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

• Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support

  • unaffected 0:3.1.2-14.el7_9.2 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:3.3.3-7.el8_10 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support

  • unaffected 0:3.3.2-8.el8_2.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

  • unaffected 0:3.3.3-1.el8_4.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

  • unaffected 0:3.3.3-1.el8_4.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

  • unaffected 0:3.3.3-6.el8_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update Service

  • unaffected 0:3.3.3-6.el8_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions

  • unaffected 0:3.3.3-6.el8_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service

  • unaffected 0:3.3.3-5.el8_8.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

  • unaffected 0:3.3.3-5.el8_8.2 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:3.5.3-9.el9_7 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:3.5.3-9.el9_7 – < *

• Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

  • unaffected 0:3.5.3-2.el9_0.4 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:3.5.3-5.el9_2.2 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Extended Update Support

  • unaffected 0:3.5.3-5.el9_4 – < *

• Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support

  • unaffected 0:3.5.3-7.el9_6.1 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.12

  • unaffected 412.86.202604281506-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.13

  • unaffected 413.92.202605271328-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.14

  • unaffected 414.92.202605060243-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.15

  • unaffected 415.92.202605060220-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.16

  • unaffected 416.94.202604211449-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.17

  • unaffected 417.94.202605112123-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.18

  • unaffected 418.94.202604240015-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.19

  • unaffected 4.19.9.6.202605201155-0 – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.13.5-4.1777325677 – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.13.5-4.1777325711 – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.13.5-4.1777325710 – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.13.5-3.1777325680 – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.13.5-4.1777325709 – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.13.5-4.1777325680 – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.13.5-4.1777325708 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.17

  • unaffected 1791371080 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.17

  • unaffected 1791371069 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.17

  • unaffected 1791788287 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.17

  • unaffected 1791970484 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.18

  • unaffected 1791459707 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.18

  • unaffected 1791459711 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.18

  • unaffected 1791459759 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.18

  • unaffected 1789029076 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.18

  • unaffected 1791966259 – < *

• Red Hat · Cert Manager support for Red Hat OpenShift release 1.20

  • unaffected 1790598593 – < *

• Red Hat · Red Hat AI Inference Server 3.2

  • unaffected 1779223654 – < *

• Red Hat · Red Hat AI Inference Server 3.2

  • unaffected 1779223651 – < *

• Red Hat · Red Hat AI Inference Server 3.2

  • unaffected 1780681984 – < *

• Red Hat · Red Hat AI Inference Server 3.3

  • unaffected 1778244559 – < *

• Red Hat · Red Hat AI Inference Server 3.3

  • unaffected 1778244531 – < *

• Red Hat · Red Hat AI Inference Server 3.3

  • unaffected 1778274666 – < *

• Red Hat · Red Hat AI Inference Server 3.3

  • unaffected 1778244546 – < *

• Red Hat · Red Hat Discovery 2

  • unaffected 1778156756 – < *

• Red Hat · Red Hat Hardened Images

  • unaffected 3.8.7-1.hum1 – < *

• Red Hat · Red Hat Insights proxy 1.5

  • unaffected 1776868961 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1776868774 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1776868744 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1776868772 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1776868842 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1777459441 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1777454300 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1777459504 – < *

• Red Hat · Red Hat Enterprise Linux 10

  All versions: unknown

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unknown

What to do

Workaround: To mitigate this issue, avoid processing untrusted ISO9660 images with applications that utilize `libarchive`. Users should only extract or read content from ISO images obtained from trusted sources.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-17073 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-5121](https://cveledger.app/badge/CVE-2026-5121.svg)](https://cveledger.app/cve/CVE-2026-5121)

Record last updated 5 Nov 2026, 21:17 UTC.