CVE-2026-4426
Libarchive: libarchive: denial of service via malformed iso file processing
6.5CVSSMEDIUM
Description
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 Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:RUser InteractionRequired
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
and 6 more affected products View all →
Exploitability
Official Patch Available
Workaround Available
References
https://access.redhat.com/errata/RHSA-2026:8944
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-4426
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2449010
bugzilla.redhat.com
and 1 more references View all →
Timeline
Published
Mar 19, 2026
Last Updated
May 3, 2026
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