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.

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

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.

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

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