CVE-2026-4426

A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:8944
https://access.redhat.com/security/cve/CVE-2026-4426	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2449010	Issue Tracking Third Party Advisory
https://github.com/libarchive/libarchive/pull/2897	Issue Tracking Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:libarchive:libarchive:-:::::::*
	cpe:2.3:a:redhat:hardened_images:-:::::::*
	cpe:2.3:a:redhat:openshift_container_platform:4.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:6.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:10.0:::::::*

History

No history.

Information

Published : 2026-03-19 15:16

Updated : 2026-09-01 13:19

NVD link : CVE-2026-4426

Mitre link : CVE-2026-4426

CVE.ORG link : CVE-2026-4426

JSON object : View

Products Affected

redhat

enterprise_linux
openshift_container_platform
hardened_images

libarchive

libarchive

CWE

CWE-1335

Incorrect Bitwise Shift of Integer

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An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition."}, {"lang": "es", "value": "Se encontr\u00f3 un defecto en libarchive. Existe una vulnerabilidad de comportamiento indefinido en la l\u00f3gica de descompresi\u00f3n de zisofs, causada por una validaci\u00f3n incorrecta de un campo ('pz_log2_bs') le\u00eddo de las extensiones Rock Ridge de ISO9660. Un atacante remoto puede explotar esto al proporcionar un archivo ISO especialmente dise\u00f1ado. Esto puede llevar a una asignaci\u00f3n de memoria incorrecta y posibles ca\u00eddas de la aplicaci\u00f3n, lo que resulta en una condici\u00f3n de denegaci\u00f3n de servicio (DoS)."}], "lastModified": "2026-09-01T13:19:39.630", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:libarchive:libarchive:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6A51945D-40D7-4C28-B0BB-774687265DCE"}, {"criteria": "cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "87DEB507-5B64-47D7-9A50-3B87FD1E571F"}, {"criteria": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "932D137F-528B-4526-9A89-CD59FA1AB0FE"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2F6AB192-9D7D-4A9A-8995-E53A9DE9EAFC"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}