Libarchive: libarchive: denial of service via malformed iso file processing
CVE-2026-4426 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-4426, released March 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bsdcpio · Ubuntu 18.04.6 LTS (bionic) | 3.2.2-3.1ubuntu0.7+esm3 | bsdcpio 3.2.2-3.1ubuntu0.7+esm3 | Mar 30, 2026 |
| bsdtar · Ubuntu 18.04.6 LTS (bionic) | 3.2.2-3.1ubuntu0.7+esm3 | bsdtar 3.2.2-3.1ubuntu0.7+esm3 | Mar 30, 2026 |
| libarchive · Debian 12.15 (bookworm) | 3.6.2-1+deb12u4 | DEBIAN-CVE-2026-4426 | Mar 19, 2026 |
| libarchive · Debian 13.5 (trixie) | 3.7.4-4+deb13u1 | DEBIAN-CVE-2026-4426 | Mar 19, 2026 |
| libarchive · Debian 14 | 3.8.7-1 | DEBIAN-CVE-2026-4426 | Mar 19, 2026 |
| libarchive · sles 15.6 | 3.7.2-150600.3.20.1 | SUSE-SU-2026:2490-1 | Jun 22, 2026 |
| libarchive · sles 15.7 | 3.7.2-150600.3.20.1 | SUSE-SU-2026:2490-1 | Jun 22, 2026 |
| libarchive-tools · Ubuntu 18.04.6 LTS (bionic) | 3.2.2-3.1ubuntu0.7+esm3 | libarchive-tools 3.2.2-3.1ubuntu0.7+esm3 | Mar 30, 2026 |
| libarchive-tools · Ubuntu 20.04 LTS (focal) | 3.4.0-2ubuntu1.5+esm2 | libarchive-tools 3.4.0-2ubuntu1.5+esm2 | Mar 30, 2026 |
| libarchive-tools · Ubuntu 22.04.1 LTS (jammy) | 3.6.0-1ubuntu1.7 | libarchive-tools 3.6.0-1ubuntu1.7 | Mar 30, 2026 |
| libarchive-tools · Ubuntu 24.04.5 LTS (noble) | 3.7.2-2ubuntu0.7 | libarchive-tools 3.7.2-2ubuntu0.7 | Mar 30, 2026 |
| libarchive-tools · Ubuntu 25.10 (questing) | 3.7.7-0ubuntu3.2 | libarchive-tools 3.7.7-0ubuntu3.2 | Mar 30, 2026 |
| libarchive-tools · Ubuntu 26.04.1 LTS (resolute) | 3.8.5-1ubuntu2.1 | libarchive-tools 3.8.5-1ubuntu2.1 | Mar 30, 2026 |
| libarchive13 · Ubuntu 18.04.6 LTS (bionic) | 3.2.2-3.1ubuntu0.7+esm3 | libarchive13 3.2.2-3.1ubuntu0.7+esm3 | Mar 30, 2026 |
| libarchive13 · Ubuntu 20.04 LTS (focal) | 3.4.0-2ubuntu1.5+esm2 | libarchive13 3.4.0-2ubuntu1.5+esm2 | Mar 30, 2026 |
| libarchive13 · Ubuntu 22.04.1 LTS (jammy) | 3.6.0-1ubuntu1.7 | libarchive13 3.6.0-1ubuntu1.7 | Mar 30, 2026 |
| libarchive13t64 · Ubuntu 24.04.5 LTS (noble) | 3.7.2-2ubuntu0.7 | libarchive13t64 3.7.2-2ubuntu0.7 | Mar 30, 2026 |
| libarchive13t64 · Ubuntu 25.10 (questing) | 3.7.7-0ubuntu3.2 | libarchive13t64 3.7.7-0ubuntu3.2 | Mar 30, 2026 |
| libarchive13t64 · Ubuntu 26.04.1 LTS (resolute) | 3.8.5-1ubuntu2.1 | libarchive13t64 3.8.5-1ubuntu2.1 | Mar 30, 2026 |
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