CVE-2026-77387 geopy: Regular Expression Denial of Service (ReDoS) in geopy.Point
An attacker can cause a denial of service in applications using geopy by sending long malformed coordinate strings that trigger inefficient regular expression processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-77387?
CVE-2026-77387 is a medium-severity denial of service vulnerability in geopy, published on 1 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
geopy is a geocoding library for Python. Prior to 2.5.0, geopy.Point and Point.from_string() can spend excessive CPU time due to inefficient regular-expression behavior when an application passes a long malformed coordinate string without the 256-character input limit used by the fix. Geocoder reverse methods also reach the vulnerable parsing path when called with string inputs. Repeated attacker-controlled requests can cause a denial of service, while the numeric Point constructor is unaffected. This issue is fixed in version 2.5.0.
Weakness: CWE-1333
Which versions are affected by CVE-2026-77387?
3 open source packages ship an affected version, including geopy.
| Package | Affected | Fixed in |
|---|---|---|
geopy PyPI | All versions | 2.5.0 |
geopy PyPI | All versions | 2.5.0 |
geopy PyPI | All versions | 2.5.0 |
Linux distribution packages (1)
python-geopy openSUSE:Tumbleweed | All versions | 2.5.0-1.1 |
How do I fix CVE-2026-77387?
Upgrade geopy to 2.5.0 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-2026-77387 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77387 exists.
Sources
Also known as CLEANSTART-2026-QB35477, DEBIAN-CVE-2026-77387, ECHO-028b-f7e1-fcde, GHSA-mhvh-fq92-pfmr, PYSEC-2026-4218, UBUNTU-CVE-2026-77387 and 1 more.