# CVE-2026-109348: Gitoxide gix-mailmap quadratic parsing denial of service

Source: https://junglewise.ai/threats/cve-2026-109348-gitoxide-gix-mailmap-before-0-35-0-contains-a-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-12. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-109348 · Severity: medium · CVSS 4.3 · Published 2026-10-12

Gitoxide gix-mailmap is a library component that processes author identity mappings in Git repositories. A crafted .mailmap file with specially ordered entries can force a denial of service by consuming CPU for minutes, blocking legitimate operations like git log, blame, or shortlog on shared infrastructure processing untrusted repositories.

Vendors: [GitoxideLabs](https://junglewise.ai/threats/vendors/gitoxidelabs).

## Quick answers

**Is CVE-2026-109348 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109348 being exploited in the wild.

**How severe is CVE-2026-109348?** Medium severity, with a CVSS score of 4.3, published 12 October 2026.

**Which products and versions are affected?** GitoxideLabs Gix-Mailmap before 0.35.0.

**Is there a fix for CVE-2026-109348?** Yes: fixed in 0.35.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-109348 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-109348?** Check whether you run GitoxideLabs Gix-Mailmap at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 0.35.0

## Technical details

The vulnerability is a quadratic-time algorithmic complexity flaw in Snapshot::from_bytes that parses .mailmap files. Each entry is inserted into a sorted vector using Vec::insert at a calculated position, which shifts all following elements; entries ordered in descending sequence force repeated front inserts, costing O(n²) moves overall. An attacker commits a malicious .mailmap to a repository; any tool using gitoxide to resolve author identities loads it unprompted, triggering the CPU exhaustion.

## Affected products

- GitoxideLabs gix-mailmap before 0.35.0

## Timeline

- 2026-09-25: disclosed
- 2026-10-12: advisory

## References

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