Undefined Behavior Vulnerability in libarchive Affecting ISO9660 Rock Ridge Extensions
CVE-2026-4426

6.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
19 March 2026

What is CVE-2026-4426?

A vulnerability has been identified in libarchive related to the zisofs decompression logic, where insufficient validation of the field 'pz_log2_bs' from ISO9660 Rock Ridge extensions can result in undefined behavior. A remote attacker could exploit this flaw by sending a specially crafted ISO file, which may lead to incorrect memory allocation, application crashes, or potentially a denial-of-service (DoS) condition. Proper remediation and validation checks are essential to address this security risk.

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References

https://access.redhat.com/security/cve/CVE-2026-4426
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2449010
issue-trackingx_refsource_REDHAT
https://github.com/libarchive/libarchive/pull/2897

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Elhanan Haenel for reporting this issue.
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