Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M

CVE-2026-50127Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)

Medium 5.9

In plain English

A medium-severity server-side request forgery in weblate from WeblateOrg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.3%top 76.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	weblate	2026.6	GHSA-vmfc-9982-2m45
PyPI	weblate	2026.6	PYSEC-2026-3416

Affected products (as reported)

Vendor	Product	Versions
WeblateOrg	weblate	>= 5.15, < 2026.6

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45 x_refsource_CONFIRM
https://github.com/WeblateOrg/weblate/pull/19768 x_refsource_MISC
https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6 x_refsource_MISC