PT-2026-30880 · Unknown+1 · Libarchive+1

Published 2026-04-07 · Updated 2026-05-03 · CVE-2026-5745

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions libarchive (affected versions not specified)

Description A flaw exists in libarchive's ACL parsing logic within the archive acl from text nl() function. Insufficient validation when processing malformed ACL strings, such as a bare "d" or "default" tag without subsequent fields, leads to a NULL pointer dereference. An attacker can provide a crafted archive to cause a Denial of Service (DoS) in applications using the libarchive API, like bsdtar.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-5745

ECHO-56A7-5917-6302

RHSA-2026:8944

Affected Products

Bsdtar

Libarchive

References · 12

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5745 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5745 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5745 · Security Note
• https://access.redhat.com/errata/RHSA-2026:8944 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-5745 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5745 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-5745 · Security Note
• https://twitter.com/VulmonFeeds/status/2041576047670337993 · Twitter Post
• https://twitter.com/CVEnew/status/2041603223090250137 · Twitter Post
• https://bugzilla.redhat.com/show_bug.cgi?id=2455921 · Note
• https://t.me/cveNotify/161933 · Telegram Post
• https://access.redhat.com/security/cve/CVE-2026-5745 · Note