GHSA-r3fp-vrpw-pg77

GHSA-r3fp-vrpw-pg77 PUBLISHED CVSS 6.5 MEDIUM

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.

Risk Scores

CVSS v3.1

6.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Timeline

Mar 19, 2026 CVE Published
Apr 10, 2026 Security Advisory
May 3, 2026 CVE Updated
May 7, 2026 Distribution Patch

References

https://nvd.nist.gov/vuln/detail/CVE-2026-4426 advisory
https://github.com/libarchive/libarchive/pull/2897 url
https://access.redhat.com/security/cve/CVE-2026-4426 url
https://bugzilla.redhat.com/show_bug.cgi?id=2449010 url
https://access.redhat.com/errata/RHSA-2026:8944 url

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