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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift AI (RHOAI) | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libarchive | 3.8.7-1 | — |
| Debian 13 | libarchive | 3.7.4-4+deb13u1 | — |
| Debian 12 | libarchive | 3.6.2-1+deb12u4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libarchive | 3.8.5-1ubuntu2.1 | USN-8292-1 |
| Ubuntu 25.10 | libarchive | 3.7.7-0ubuntu3.2 | USN-8292-1 |
| Ubuntu 24.04 LTS | libarchive | 3.7.2-2ubuntu0.7 | USN-8292-1 |
| Ubuntu 22.04 LTS | libarchive | 3.6.0-1ubuntu1.7 | USN-8292-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libarchive | 3.4.0-2ubuntu1.5+esm2 | USN-8292-1 |
| Ubuntu Pro 18.04 LTS | libarchive | 3.2.2-3.1ubuntu0.7+esm3 | USN-8292-1 |
| Ubuntu Pro 16.04 LTS | libarchive | 3.1.2-11ubuntu0.16.04.8+esm3 | USN-8292-1 |
| Ubuntu Pro 14.04 LTS | libarchive | 3.1.2-7ubuntu2.8+esm5 | USN-8292-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | libarchive +1 | 3.8.7-1.hum1 | RHSA-2026:8944 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libarchive | 3.7.2-150600.3.20.1 | SUSE-SU-2026:2490-1 |
| SLES 15 SP6 | libarchive | 3.7.2-150600.3.20.1 | SUSE-SU-2026:2490-1 |
| SLES 15 SP5 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLES 15 SP4 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLES 12 SP5 | libarchive | 3.3.3-32.17.1 | SUSE-SU-2026:2747-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | libarchive | 3.7.2-150600.3.20.1 | SUSE-SU-2026:2490-1 |
| SLES for SAP 15 SP5 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLES for SAP 15 SP4 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLE Micro 6.1 | libarchive | 3.7.4-slfo.1.1_4.1 | SUSE-SU-2026:22248-1 |
| SLE Micro 6.0 | libarchive | 3.6.2-6.1 | SUSE-SU-2026:22241-1 |
| SLE Micro 5.5 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLE Micro 5.4 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLE Micro 5.3 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLE HPC 15 SP5 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
| SLE HPC 15 SP4 | libarchive | 3.5.1-150400.3.24.1 | SUSE-SU-2026:2599-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libarchive | 3.7.7-6 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | libarchive +3 | 3.8.7-r2 | — |
Advisories 8
- RHSA-2026:8944 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-0803 libarchive: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen und DoS BSI CERT-Bund (WID) · Oct 14, 2026
- SUSE-SU-2026:2747-1 Security update for libarchive SUSE / openSUSE Security Updates · Jul 4, 2026
- SUSE-SU-2026:22248-1 Security update for libarchive SUSE / openSUSE Security Updates · Jun 26, 2026
- SUSE-SU-2026:22241-1 Security update for libarchive SUSE / openSUSE Security Updates · Jun 26, 2026
- SUSE-SU-2026:2599-1 Security update for libarchive SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:2490-1 Security update for libarchive SUSE / openSUSE Security Updates · Jun 24, 2026
- USN-8292-1 libarchive vulnerabilities Ubuntu Security Notices (USN) · May 21, 2026
References
- RHSA-2026:8944 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-4426 vdb-entry
- RHBZ#2449010 issue-tracking
- https://github.com/libarchive/libarchive/pull/2897