Medium severity · published Jun 10, 2026
CVE-2026-50127
Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)
5.9
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
weblate · WeblateOrg
>= 5.15, < 2026.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50127
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-50127
github.com
https://github.com/WeblateOrg/weblate/pull/19768
github.com
https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6
github.com
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45
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