CVE-2026-5745 — MEDIUM (5.5)

Vulnerability Description

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 Score

5.5

MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Libarchive	Libarchive	-
Redhat	Hardened Images	-
Redhat	Openshift Container Platform	4.0
Redhat	Enterprise Linux	6.0

Related Weaknesses (CWE)

CWE-476

References

https://access.redhat.com/errata/RHSA-2026:8944
https://access.redhat.com/security/cve/CVE-2026-5745Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455921Issue TrackingThird Party Advisory

FAQ

What is CVE-2026-5745?

CVE-2026-5745 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 s...

How severe is CVE-2026-5745?

CVE-2026-5745 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-5745?

Check the references section above for vendor advisories and patch information. Affected products include: Libarchive Libarchive, Redhat Hardened Images, Redhat Openshift Container Platform, Redhat Enterprise Linux.