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CVE-2026-41991 is an insecure temporary-file handling vulnerability in GNU gzip's gzexe utility. If mktemp is unavailable in the executing user's PATH, gzexe falls back to a temporary filename derived solely from its process ID and creates it without exclusive creation or an existence check. A local attacker can predict that name and pre-create it as a symbolic link to a file writable by the user running gzexe. gzexe follows the link when writing its temporary output, creating a TOCTOU condition that permits an arbitrary file overwrite in the victim's write context.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
40 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Unity Linux vulnerability addressed by advisory UTSA-2026-107043. The provided CVSS v3 vector characterizes it as a local integrity-impacting flaw with high attack complexity and low privileges required.
A vulnerability in the gzip package addressed by AlmaLinux 8 advisory RHSA-2026:65998. The content does not map a specific CWE or technical impact to this individual CVE.
A disclosed vulnerability affecting the gzip package on Rocky Linux 8. The content provides no technical description, exploitation status, or mitigation detail specific to this CVE.
A specific vulnerability addressed by Ubuntu Security Notice USN-8733-1 for gzip; the content provides no technical vulnerability description.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.