CVE-2026-109348: Gitoxide gix-mailmap before 0.35.0 CPU Denial of Service via .mailmap Parsing

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-12 · updated 2026-10-16
Weakness: CWE-407

Description

Gitoxide gix-mailmap before 0.35.0 contains a denial of service vulnerability that allows attackers to exhaust CPU through quadratic-time parsing in Snapshot::from_bytes. Attackers can commit a crafted .mailmap with descending-ordered entries forcing repeated front inserts, blocking workers running log, blame, or shortlog for minutes.

Affected products

GitoxideLabs gix-mailmap: before 0.35.0 — fixed in 0.35.0

How to fix

Upgrade to a fixed version: GitoxideLabs gix-mailmap 0.35.0. Check the vendor advisory for mitigations.

References

https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-pmpw-wwcm-r8rc
https://www.vulncheck.com/advisories/gitoxide-gix-mailmap-before-0.35.0-cpu-denial-of-service-via-mailmap-parsing
https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-pmpw-wwcm-r8rc

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