CVE-2026-110856 GitPython before 3.2.0 ReDoS via _re_actor_epoch in parse_actor_and_date
Attackers can cause CPU exhaustion in GitPython by serving repositories with specially crafted commit or tag objects, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-110856?
CVE-2026-110856 is a high-severity denial of service vulnerability in gitpython-developers GitPython, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
GitPython before 3.2.0 contains a regular expression denial of service vulnerability in the _re_actor_epoch pattern used by parse_actor_and_date on author, committer, and tagger lines. Attackers can serve repositories with commit or tag objects containing long space-filled lines lacking a valid epoch or timezone, causing quadratic backtracking and CPU exhaustion.
Weakness: CWE-1333
Which versions are affected by CVE-2026-110856?
2 open source packages ship an affected version, including GitPython and gitpython.
| Package | Affected | Fixed in |
|---|---|---|
GitPython PyPI | All versions | 3.2.0 |
gitpython PyPI | All versions | 3.2.0 |
How do I fix CVE-2026-110856?
Upgrade GitPython to 3.2.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-110856 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110856 exists.
Sources
Also known as DEBIAN-CVE-2026-110856, ECHO-f57e-0c53-463f, GHSA-f52j-wg44-2h83, GHSA-m64x-33q8-m5h7, MINI-9wcp-3rfq-94mv, UBUNTU-CVE-2026-110856.