← Vulnerability feed

Vulnerability record · CVE-2026-41992 · published 29 June 2026

CVE-2026-41992: Gnu gzip vulnerability

Gnu · Gzip

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.

6.9 CVSS 4.0 Medium EPSS 0.62% · top 49.7% CWE-126 · CWE-126
6.9CVSS 4.0 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
25 Oct 2026Last modified by NVD

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert.pl/en/posts/2026/04/CVE-2026-41991/ Broken Link
https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=63dbf6b3b9e6e781df1a6a64e609b10e23969681 Patch
https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=e7378c2d421be6a286922374425680bbe9ad8b7d
https://www.gnu.org/software/gzip/ Product
http://www.openwall.com/lists/oss-security/2026/08/23/1
http://www.openwall.com/lists/oss-security/2026/08/25/1
http://www.openwall.com/lists/oss-security/2026/08/27/2

Track CVE-2026-41992 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-0603Gnu gzip vulnerabilitygzexe in gzip 1.3.3 and earlier will execute an argument when the creation of a temp file fails instead of exiting the program, which could allow rem…EPSS 3.1%8.8CVE-2022-1271Gnu gzip improper input validation vulnerabilityAn arbitrary file write vulnerability was found in GNU gzip's zgrep utility. When zgrep is applied on the attacker's chosen file name (for example, a…EPSS 5.5%7.5CVE-2001-1228Gnu gzip vulnerabilityBuffer overflows in gzip 1.3x, 1.2.4, and other versions might allow attackers to execute code via a long file name, possibly remotely if gzip is run…EPSS 3.1%6.8CVE-2009-2624Gnu gzip improper input validation vulnerabilityThe huft_build function in inflate.c in gzip before 1.3.13 creates a hufts (aka huffman) table that is too small, which allows remote attackers to ca…EPSS 4.2%6.8CVE-2010-0001Gnu gzip vulnerabilityInteger underflow in the unlzw function in unlzw.c in gzip before 1.4 on 64-bit platforms, as used in ncompress and probably others, allows remote at…EPSS 4.8%5.0CVE-2005-1228Gnu gzip vulnerabilityDirectory traversal vulnerability in gunzip -N in gzip 1.2.4 through 1.3.5 allows remote attackers to write to arbitrary directories via a .. (dot do…EPSS 3.6%4.6CVE-2005-0758Gnu gzip vulnerabilityzgrep in gzip before 1.3.5 does not properly sanitize arguments, which allows local users to execute arbitrary commands via filenames that are inject…EPSS 0.53%3.7CVE-2005-0988Gnu gzip vulnerabilityRace condition in gzip 1.2.4, 1.3.3, and earlier, when decompressing a gzipped file, allows local users to modify permissions of arbitrary files via …EPSS 0.66%

Source: NIST National Vulnerability Database (record CVE-2026-41992), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.