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Red Hat Enterprise Linux 10 CVE-2026-5745

| EUVDEUVD-2026-19705 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-04-07 redhat GHSA-fjqv-vj6q-4fcm
5.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
EUVD ID Assigned
Apr 07, 2026 - 15:30 euvd
EUVD-2026-19705
Analysis Generated
Apr 07, 2026 - 15:30 vuln.today
CVE Published
Apr 07, 2026 - 14:57 nvd
MEDIUM 5.5

DescriptionCVE.org

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).

AnalysisAI

Libarchive's archive_acl_from_text_nl() function fails to validate malformed ACL strings before dereferencing pointers, allowing local attackers to crash applications that process untrusted archives via specially crafted ACL fields. This NULL pointer dereference results in denial of service with high availability impact. CVSS 5.5 reflects local attack vector and user interaction requirement; no public exploit code or active exploitation confirmed at analysis time.

Technical ContextAI

Libarchive is a widely-used C library for reading and writing archives (tar, zip, ISO, cpio, etc.). The vulnerability resides in ACL (Access Control List) parsing logic, specifically the archive_acl_from_text_nl() function which processes text-formatted ACL entries. The root cause (CWE-476: Null Pointer Dereference) occurs when the function advances internal pointers without validating that required subsequent fields exist after incomplete ACL tags like bare 'd' or 'default'. This allows a malicious archive containing a specially-crafted ACL string in its metadata to trigger an unhandled NULL pointer dereference. Any application linked against vulnerable libarchive versions-including bsdtar (BSD tar utility), file managers, backup tools, and container image handlers-inherits this flaw when processing archive headers.

RemediationAI

Apply the vendor-released security update for your Red Hat product: Red Hat Enterprise Linux users should apply the errata package containing the patched libarchive library from the Red Hat security advisories portal (https://access.redhat.com/security/cve/CVE-2026-5745). OpenShift Container Platform 4 users should update to the patched container base images. For systems where immediate patching is not feasible, limit processing of untrusted archives to sandboxed or isolated environments and avoid automated extraction of archives from untrusted sources. Verify that linked libarchive version is updated by checking library version strings post-patch (e.g., 'strings /usr/lib/libarchive.so | grep -i version'). No workarounds bypass the vulnerability; patching is the primary remediation.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed

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CVE-2026-5745 vulnerability details – vuln.today

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