Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)

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Summary

CVECVE-2026-50127
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-10 20:17:29 UTC
Updated2026-06-10 20:21:20 UTC
DescriptionWeblate 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, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresses to bypass private range restrictions. This issue has been patched in version 2026.6.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000300000 probability, percentile 0.091110000 (date 2026-06-11)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA WeblateOrg Weblate affected >= 5.15, < 2026.6 Not specified

References

ReferenceSourceLinkTags
github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6 [email protected] github.com
github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45 [email protected] github.com
github.com/WeblateOrg/weblate/pull/19768 [email protected] github.com
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