GHSA-vmfc-9982-2m45

Weblate SSRF: outbound URL guard misses some private ranges

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-50127

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	weblate	>= 5.15, < 2026.6	2026.6

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact Weblate's `VCS_RESTRICT_PRIVATE` did not properly account for some transitional IPv6 ranges, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresses to bypass private range restrictions. ### Patches * https://github.com/WeblateOrg/weblate/pull/19768 ### Resources The issue was reported by @tonghuaroot via GitHub, and the same user also provided the initial patch.

References

External links from the advisory. They lead to third-party sites.

https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45 web
https://nvd.nist.gov/vuln/detail/CVE-2026-50127 advisory
https://github.com/WeblateOrg/weblate/pull/19768 web
https://github.com/WeblateOrg/weblate package
https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6 web