CVE-2026-5745
MEDIUMLibarchive: a null pointer dereference vulnerability exists in the acl parser of libarchive
Title source: cnaDescription
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).
References (3)
Core 3
Core References
Issue Tracking, X_Refsource_Redhat issue-tracking
x_refsource_redhat
RHBZ#2455921
https://bugzilla.redhat.com/show_bug.cgi?id=2455921
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:8944
https://access.redhat.com/errata/RHSA-2026:8944
Vdb Entry, X_Refsource_Redhat vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-5745
Scores
CVSS v3
5.5
EPSS
0.0016
EPSS Percentile
5.8%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-476
Status
published
Products (16)
libarchive/libarchive
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
Red Hat/Red Hat Hardened Images
Red Hat/Red Hat Hardened Images
3.8.7-1.hum1
Red Hat/Red Hat OpenShift Container Platform 4
redhat/enterprise_linux
6.0
... and 6 more
Published
Apr 07, 2026
Tracked Since
Apr 07, 2026