CVE-2026-41991General(gnu / gzip)

LOWCVSS 4.7 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch gnu gzip systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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

gnu CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Patch / fix

https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=4e6f8b24ab823146ab8776f0b7fe486ab34d4269

Other references

Weakness type (CWE)

CWE-377

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

gzip

Threat summary

Patch or workaround signal is available
2 mentions across 2 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 2 signals
General: 1 classified signal
Peaked 1d ago at 1 mentions (2026-06-29); latest day: 1
2 total mentions across 2 days

Affected systems

Vendors

gnu

Products

gzip

Deep dive

Activity timeline2 mentions / 2d

Signal classification2 categories

General

150.0%

Patch

150.0%

Referenced assets2 URLs

By indicator

Classification over time

Date	Total	Labels

2026-06-29	1	General1
2026-07-02	1	Patch1

Full discourse2 posts

Daily CyberSecurity@the_yellow_fall89d
Patch
A GNU gzip vulnerability (CVE-2026-41991) lets a local attacker overwrite files through a gzexe symlink attack. Update to the patched gzip release now. #GNUgzip #gzip #CVE202641991 #CVE202641992 #gzexe #LinuxSecurity #Vulnerability http://securityonline.info/gnu-gzip-vulnerability-cve-2026-41991/
Post summary
The post announces a known gzip vulnerability (CVE‑2026‑41991) that permits local file overwrite through a gzexe symlink and urges users to apply the patched release.
02073664
12.9K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds92d
General
CVE-2026-41991 Insecure Temporary File Handling in GNU gzip gzexe Utility https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-41991
Post summary
The entry identifies CVE‑2026‑41991 as an insecure temporary file handling flaw in GNU gzip but offers no detail on PoC, exploit tools, active exploitation, or mitigation.
00000111
4.1K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	gnu	gzip	-	-	-

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