--- id: CVE-2026-4424 title: A flaw was found in libarchive summary: >- A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote atta… 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-125 - CWE-125 vendor: libarchive product: libarchive affected: - libarchive - hardened_images - openshift_container_platform = 4.0 - openshift_container_platform = 4.16 - openshift_container_platform_for_arm64 = 4.16 - openshift_container_platform_for_power = 4.16 - enterprise_linux = 6.0 - enterprise_linux = 7.0 - enterprise_linux = 8.0 - enterprise_linux = 9.0 - enterprise_linux = 10.0 - enterprise_linux_server_aus = 8.2 - enterprise_linux_server_aus = 8.4 published: '2026-03-19' updated: '2026-08-31' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4424' 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-2026:8492' 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-2026:8865' 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-2026-4424' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2449006' label: secalert@redhat.com - url: 'https://github.com/libarchive/libarchive/pull/2898' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:10065' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:10097' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:11768' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:12071' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:12274' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:13812' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:14773' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:14937' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:15087' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:16008' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:16009' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:16030' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:16174' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:17596' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:19724' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:19725' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:20040' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:21690' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:25096' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8492' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8510' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8517' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8521' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8534' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8864' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8865' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8866' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8867' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8873' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8908' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8944' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:9026' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:9592' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:9832' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-4424' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2449006' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4424.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c tags: - nvd epss: 0.01073 epssPercentile: 0.63413 ingestedAt: '2026-08-31T18:12:24.372Z' --- ## Overview A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction. ## Affected - `libarchive` - `hardened_images` - `openshift_container_platform = 4.0` - `openshift_container_platform = 4.16` - `openshift_container_platform_for_arm64 = 4.16` - `openshift_container_platform_for_power = 4.16` - `enterprise_linux = 6.0` - `enterprise_linux = 7.0` - `enterprise_linux = 8.0` - `enterprise_linux = 9.0` - `enterprise_linux = 10.0` - `enterprise_linux_server_aus = 8.2` - `enterprise_linux_server_aus = 8.4` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.