CVE-2026-109348 Gitoxide gix-mailmap before 0.35.0 CPU Denial of Service via .mailmap Parsing
Attackers can cause CPU exhaustion and block Git operations by committing a crafted .mailmap file to the repository.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109348?
CVE-2026-109348 is a medium-severity denial of service vulnerability in GitoxideLabs gix-mailmap, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-407
Which versions are affected by CVE-2026-109348?
How do I fix CVE-2026-109348?
No fix has been published for CVE-2026-109348 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-109348 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109348 exists.
Sources
Also known as DEBIAN-CVE-2026-109348, GHSA-mjrq-mxwp-ch57, GHSA-pmpw-wwcm-r8rc, UBUNTU-CVE-2026-109348.