# CVE-2026-41992: Global Buffer Overflow in GNU gzip CVE-2026-41992 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: High. - Web page: https://patchblox.com/security/cve/CVE-2026-41992 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0062 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 29, 2026 - Weakness: Buffer Over-read - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41992 ## Description GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation. By decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out‑of‑bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer. This issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and e7378c2d421be6a286922374425680bbe9ad8b7d. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | gzip Debian 13.5 (trixie) | 1.13-1+deb13u1 | [DEBIAN-CVE-2026-41992](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41992.md) | Jun 29, 2026 | | Linux | gzip Debian 14 | 1.14-1 | [DEBIAN-CVE-2026-41992](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41992.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 | 1.13-160000.4.1 | [OPENSUSE-SU-2026:21666-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21666-1.md) | Aug 27, 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 15.7 | 1.10-150200.16.1 | [SUSE-SU-2026:3592-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3592-1.md) | Aug 12, 2026 | | Linux | gzip sles 16.0 | 1.13-160000.4.1 | [SUSE-SU-2026:23550-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23550-1.md) | Aug 27, 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 2026-11-08T13:06:02Z UTC. 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