# CVE-2026-41991: gzip: GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling CVE-2026-41991 is fixed in 2 products on 1 platform, first by gzip 1.6-5ubuntu1.2+esm1, released June 29, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-41991 - Priority: Routine - CVSS: 6.0 (medium) - EPSS: 0.0012 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 29, 2026 ## Description GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks. A local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite. This issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269 ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | gzip Debian 13.5 (trixie) | 1.13-1+deb13u1 | [DEBIAN-CVE-2026-41991](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41991.md) | Jun 29, 2026 | | Linux | gzip Debian 14 | 1.14-1 | [DEBIAN-CVE-2026-41991](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41991.md) | Jun 29, 2026 | | Linux | gzip RHEL 10 | 1.13-4.el10_2 | [RHSA-2026:61625](https://patchblox.com/security/data/fix/linux/rhsa-2026-61625.md) | Jun 29, 2026 | | Linux | gzip RHEL 8 | 0:1.9-15.el8_10 | [RHSA-2026:65998](https://patchblox.com/security/data/fix/linux/rhsa-2026-65998.md) | Sep 13, 2026 | | Linux | gzip RHEL 9 | 0:1.12-2.el9_8 | [RHSA-2026:61623](https://patchblox.com/security/data/fix/linux/rhsa-2026-61623.md) | Sep 13, 2026 | | Linux | gzip Ubuntu 18.04.6 LTS (bionic) | 1.6-5ubuntu1.2+esm1 | [gzip 1.6-5ubuntu1.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gzip-1.6-5ubuntu1.2-esm1.md) | Jun 29, 2026 | | Linux | gzip Ubuntu 20.04 LTS (focal) | 1.10-0ubuntu4.1+esm1 | [gzip 1.10-0ubuntu4.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gzip-1.10-0ubuntu4.1-esm1.md) | Jun 29, 2026 | | Linux | gzip Ubuntu 22.04.1 LTS (jammy) | 1.10-4ubuntu4.2 | [gzip 1.10-4ubuntu4.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gzip-1.10-4ubuntu4.2.md) | Jul 7, 2026 | | Linux | gzip Ubuntu 24.04.5 LTS (noble) | 1.12-1ubuntu3.2 | [gzip 1.12-1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gzip-1.12-1ubuntu3.2.md) | Jul 7, 2026 | | Linux | gzip Ubuntu 26.04.1 LTS (resolute) | 1.14-1~exp2ubuntu1.1 | [gzip 1.14-1~exp2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-gzip-1.14-1-exp2ubuntu1.1.md) | Jun 29, 2026 | | Linux | gzip almalinux 10 | 1.13-4.el10_2 | [ALSA-2026:61625](https://patchblox.com/security/data/fix/linux/alsa-2026-61625.md) | Aug 31, 2026 | | Linux | gzip almalinux 8 | 1.9-15.el8_10 | [ALSA-2026:65998](https://patchblox.com/security/data/fix/linux/alsa-2026-65998.md) | Sep 9, 2026 | | Linux | gzip almalinux 9 | 1.12-2.el9_8 | [ALSA-2026:61623](https://patchblox.com/security/data/fix/linux/alsa-2026-61623.md) | Aug 31, 2026 | | Linux | gzip ol 10 | 0:1.13-4.el10_2 | [ELSA-2026-61625-0](https://patchblox.com/security/data/fix/linux/elsa-2026-61625-0.md) | Sep 1, 2026 | | Linux | gzip ol 8 | 0:1.9-15.el8_10 | [ELSA-2026-65998-0](https://patchblox.com/security/data/fix/linux/elsa-2026-65998-0.md) | Sep 10, 2026 | | Linux | gzip ol 9 | 0:1.12-2.el9_8 | [ELSA-2026-61623-0](https://patchblox.com/security/data/fix/linux/elsa-2026-61623-0.md) | Sep 1, 2026 | | Linux | gzip opensuse-leap 16.0 | 1.13-160000.3.1 | [OPENSUSE-SU-2026:21371-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21371-1.md) | Jul 18, 2026 | | Linux | gzip rocky 10 | 0:1.13-4.el10_2 | [RLSA-2026:61625](https://patchblox.com/security/data/fix/linux/rlsa-2026-61625.md) | Sep 1, 2026 | | Linux | gzip rocky 8 | 0:1.9-15.el8_10 | [RLSA-2026:65998](https://patchblox.com/security/data/fix/linux/rlsa-2026-65998.md) | Sep 10, 2026 | | Linux | gzip rocky 9 | 0:1.12-2.el9_8 | [RLSA-2026:61623](https://patchblox.com/security/data/fix/linux/rlsa-2026-61623.md) | Sep 1, 2026 | | Linux | gzip sles 15.6 | 1.10-150200.13.1 | [SUSE-SU-2026:3269-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3269-1.md) | Jul 27, 2026 | | Linux | gzip sles 15.7 | 1.10-150200.13.1 | [SUSE-SU-2026:3269-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3269-1.md) | Jul 27, 2026 | | Linux | gzip sles 16.0 | 1.13-160000.3.1 | [SUSE-SU-2026:22818-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22818-1.md) | Jul 18, 2026 | | Linux | gzip-win32 Ubuntu 18.04.6 LTS (bionic) | 1.6-5ubuntu1.2+esm1 | [gzip-win32 1.6-5ubuntu1.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gzip-win32-1.6-5ubuntu1.2-esm1.md) | Jun 29, 2026 | | Linux | gzip-win32 Ubuntu 20.04 LTS (focal) | 1.10-0ubuntu4.1+esm1 | [gzip-win32 1.10-0ubuntu4.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gzip-win32-1.10-0ubuntu4.1-esm1.md) | Jun 29, 2026 | | Linux | gzip-win32 Ubuntu 22.04.1 LTS (jammy) | 1.10-4ubuntu4.2 | [gzip-win32 1.10-4ubuntu4.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gzip-win32-1.10-4ubuntu4.2.md) | Jul 7, 2026 | | Linux | gzip-win32 Ubuntu 24.04.5 LTS (noble) | 1.12-1ubuntu3.2 | [gzip-win32 1.12-1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gzip-win32-1.12-1ubuntu3.2.md) | Jul 7, 2026 | --- Data as of 2026-11-09T13:31:49Z UTC. 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