CVE-2026-5745

A flaw was found in libarchive. A NULL pointer dereference vulnerability exists in the ACL parsing logic, specifically within the archive_acl_from_text_nl() function. When processing a malformed ACL string (such as a bare "d" or "default" tag without subsequent fields), the function fails to perform adequate validation before advancing the pointer. An attacker can exploit this by providing a maliciously crafted archive, causing an application utilizing the libarchive API (such as bsdtar) to crash, resulting in a Denial of Service (DoS).

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-26)

CWE

CWE-476

Published

2026-04-07

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• libarchive:libarchive
• redhat:enterprise_linux
• redhat:hardened_images
• redhat:openshift_container_platform

References

• https://access.redhat.com/errata/RHSA-2026:8944
• https://access.redhat.com/security/cve/CVE-2026-5745
• https://bugzilla.redhat.com/show_bug.cgi?id=2455921

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