CVE-2026-41992 — Buffer Over-read in GNU Gzip

Vendor	Product	Version range	Fixed in
gnu	gzip	<= 1.14	—
ubuntu	gzip	—	—

Ubuntu

Gzip vulnerabilities

vendor_ubuntu·2026-09-22·CVSS 4.7

CVE-2026-41991 [MEDIUM] Gzip vulnerabilities Title: Gzip vulnerabilities Summary: Several security issues were fixed in Gzip. USN-8733-1 fixed vulnerabilities in Gzip. This update provides the corresponding fix for Gzip on Ubuntu 14.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. Original advisory details: Michał Majchrowicz and Marcin Wyczechowski discovered that Gzip's gzexe utility created temporary files in an insecure manner when mktemp was unavailable. A local attacker could possibly use this issue to overwrite arbitrary files. (CVE-2026-41991) Elias Hasas, Michał Majchrowicz and Marcin Wyczechowski discovered that Gzip incorrectly handled certain compressed files. An attacker could possibly use this issue to obtain sensitive information or cause Gzip to crash, resulting in a denial of service. (CVE-2026-41992) Instruction

Ubuntu

Gzip vulnerabilities

vendor_ubuntu·2026-09-07·CVSS 4.7

CVE-2026-41992 [MEDIUM] Gzip vulnerabilities Title: Gzip vulnerabilities Summary: Several security issues were fixed in Gzip. Michał Majchrowicz and Marcin Wyczechowski discovered that Gzip's gzexe utility created temporary files in an insecure manner when mktemp was unavailable. A local attacker could possibly use this issue to overwrite arbitrary files. (CVE-2026-41991) Elias Hasas, Michał Majchrowicz and Marcin Wyczechowski discovered that Gzip incorrectly handled certain compressed files. An attacker could possibly use this issue to obtain sensitive information or cause Gzip to crash, resulting in a denial of service. (CVE-2026-41992) Instructions: In general, a standard system update will make all the necessary changes.

Ubuntu

Gzip vulnerabilities

vendor_ubuntu·2026-07-06·CVSS 4.7

CVE-2026-41992 [MEDIUM] Gzip vulnerabilities Title: Gzip vulnerabilities Summary: Several security issues were fixed in Gzip. It was discovered that Gzip's gzexe utility handled temporary files in an insecure manner. When the mktemp utility was not available, gzexe constructed a temporary file path based on the process ID, which could be predicted. A local attacker could possibly use this issue to overwrite arbitrary files via a symlink attack. (CVE-2026-41991) It was discovered that Gzip incorrectly handled certain compressed files. An attacker could possibly use this issue to obtain sensitive information or cause Gzip to crash, resulting in a denial of service. (CVE-2026-41992) Instructions: In general, a standard system update will make all the necessary changes.

Red Hat

gzip: gzip: Information disclosure via global buffer overflow in LZH decompression

vendor_redhat·2026-06-29·CVSS 7.5

CVE-2026-41992 [HIGH] CWE-125 gzip: gzip: Information disclosure via global buffer overflow in LZH decompression gzip: gzip: Information disclosure via global buffer overflow in LZH decompression 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

VulDB

GNU gzip up to 1.14 LZH Decoder buffer over-read (EUVD-2026-40069 / Nessus ID 325426)

vuldb·2026-07-08·CVSS 7.5

CVE-2026-41992 [HIGH] GNU gzip up to 1.14 LZH Decoder buffer over-read (EUVD-2026-40069 / Nessus ID 325426) A vulnerability marked as problematic has been reported in GNU gzip up to 1.14. This issue affects some unknown processing of the component LZH Decoder. The manipulation leads to buffer over-read. This vulnerability is traded as CVE-2026-41992. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to install a patch to address this issue.

GHSA

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 executio

ghsa_unreviewed·2026-06-29

CVE-2026-41992 [MEDIUM] CWE-126 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 executio 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 the commit 63dbf6b3b9e6e781d

CVE-2026-41992: GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different…

Affected

CVSS provenance