Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck
CVE-2026-109349gix-pack before 0.75.0 Reachable Assertion DoS via Pack Version 3 Header
Medium 6.5
In plain English
A medium-severity security flaw in gix-pack from GitoxideLabs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 80.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
gitoxide gix-pack before 0.75.0 contains a reachable assertion in BytesToEntriesIter::new_from_header: the pack header decoder accepts version 3, but a release-enabled assert_eq! requires version 2. A malicious remote can send a 12-byte pack header declaring version 3 to panic the client and abort the clone or fetch.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | rust-gix-pack | no fix listed | DEBIAN-CVE-2026-109349 |
| Debian:14 | rust-gix-pack | no fix listed | DEBIAN-CVE-2026-109349 |
| Ubuntu:26.04:LTS | rust-gix | no fix listed | UBUNTU-CVE-2026-109349 |
| Ubuntu:26.10 | rust-gix | no fix listed | UBUNTU-CVE-2026-109349 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GitoxideLabs | gix-pack | 0 – before 0.75.0 |
Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-633h-mqjc-8rwg) vendor-advisory
- VulnCheck Advisory: gix-pack before 0.75.0 Reachable Assertion DoS via Pack Version 3 Header third-party-advisory