Vulnerability · Published Mar 19, 2026 · Assigned by redhat
CVE-2026-4426Libarchive: libarchive: denial of service via malformed iso file processing
Medium 6.5
In plain English
A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libarchive | 3.6.2-1+deb12u4 | DEBIAN-CVE-2026-4426 |
| Debian:13 | libarchive | 3.7.4-4+deb13u1 | DEBIAN-CVE-2026-4426 |
| Debian:14 | libarchive | 3.8.7-1 | DEBIAN-CVE-2026-4426 |
| Ubuntu:22.04:LTS | libarchive | 3.6.0-1ubuntu1.7 | USN-8292-1 |
| Ubuntu:22.04:LTS | libarchive | 3.6.0-1ubuntu1.7 | UBUNTU-CVE-2026-4426 |
| Ubuntu:24.04:LTS | libarchive | 3.7.2-2ubuntu0.7 | USN-8292-1 |
| Ubuntu:24.04:LTS | libarchive | 3.7.2-2ubuntu0.7 | UBUNTU-CVE-2026-4426 |
| Ubuntu:25.10 | libarchive | 3.7.7-0ubuntu3.2 | USN-8292-1 |
| Ubuntu:25.10 | libarchive | 3.7.7-0ubuntu3.2 | UBUNTU-CVE-2026-4426 |
| Ubuntu:26.04:LTS | libarchive | 3.8.5-1ubuntu2.1 | UBUNTU-CVE-2026-4426 |
| Ubuntu:26.04:LTS | libarchive | 3.8.5-1ubuntu2.1 | USN-8292-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-1335 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- RHSA-2026:8944 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-4426 vdb-entry, x_refsource_REDHAT
- RHBZ#2449010 issue-tracking, x_refsource_REDHAT
- https://github.com/libarchive/libarchive/pull/2897