CVE-2026-77573 Weblate: DNS rebinding in VCS operations allows server-side request forgery
Attackers can exploit DNS rebinding in Weblate VCS operations to access internal services and expose private repository contents.
- 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-2026-77573?
CVE-2026-77573 is a low-severity server-side request forgery vulnerability in WeblateOrg weblate, published on 26 Aug 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. In versions prior to 2026.8, a user permitted to manage component repository URLs can perform server-side request forgery against internal services through DNS rebinding during VCS operations. Weblate validates the hostname's first DNS resolution, but the external VCS clients that later connect perform a separate DNS lookup, so an attacker-controlled hostname that initially resolves to a public address can be re-pointed to an internal or private address before the connection is made. By triggering a clone, fetch, push, or similar remote operation, the attacker can cause Weblate to reach internal VCS-compatible services and potentially expose private repository contents. Installations that permit untrusted repository hostnames while using VCS_RESTRICT_PRIVATE=True are affected. This issue is fixed in version 2026.8.
Which versions are affected by CVE-2026-77573?
How do I fix CVE-2026-77573?
No fix has been published for CVE-2026-77573 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-77573 being exploited?
There is no known exploitation of CVE-2026-77573 in the wild and no public exploit code.
Sources
Also known as GHSA-45m9-pf98-8jmq.