CVE-2026-50127

MEDIUM

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

Title source: cna
STIX 2.1

Description

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, 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.

References (3)

Core 3
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/WeblateOrg/weblate/pull/19768

Scores

CVSS v3 5.9
EPSS 0.0029
EPSS Percentile 20.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-918
Status published
Products (1)
WeblateOrg/weblate >= 5.15, < 2026.6
Published Jun 10, 2026
Tracked Since Jun 11, 2026