CVE-2026-86035 Weblate: Mercurial argument injection via repository filenames allows authenticated command execution
Authenticated users can execute arbitrary commands via argument injection in Mercurial filenames within Weblate.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86035?
CVE-2026-86035 is a high-severity command injection vulnerability in WeblateOrg weblate, published on 29 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Weblate is a web-based continuous localization platform used to manage software translations. Weblate 4.11.1 through 2026.7.1 contains an argument-injection vulnerability in its Mercurial backend. Repository filenames beginning with - could be interpreted as Mercurial options instead of literal paths. An authenticated user with project-scoped component.edit permission could exploit this through a Mercurial-backed RESX component using the Update RESX files add-on. A later repository update could execute arbitrary commands with the privileges of the Weblate service account. This is a residual incomplete fix for CVE-2022-23915. This issue has been patched in version 2026.8.
Which versions are affected by CVE-2026-86035?
How do I fix CVE-2026-86035?
No fix has been published for CVE-2026-86035 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-86035 being exploited?
There is no known exploitation of CVE-2026-86035 in the wild and no public exploit code.
Sources
Also known as GHSA-327h-qqgm-qv55.