Weblate SSRF: outbound URL guard misses some private ranges
### 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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-50127US | — | — | ||
Weblate is a web based localization tool. From version 5.15 to before version 2026.6, Weblate's VCS_RESTRICT_PRIVATE did not properly account for some transitional IPv6 ranges, mul… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/WeblateOrg/weblatePACKAGE
- https://github.com/WeblateOrg/weblate/pull/19768WEB
- https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6WEB
- https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45WEB
- https://github.com/advisories/GHSA-vmfc-9982-2m45ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-50127ADVISORY
- https://pypi.org/project/weblatePACKAGE
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