{"id":"CVE-2026-50127","aliases":["GHSA-vmfc-9982-2m45","PYSEC-2026-3416"],"url":"https://o3.security/vulnerability/CVE-2026-50127","summary":"Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)","details":"### Impact\n\nWeblate'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.\n\n### Patches\n\n* https://github.com/WeblateOrg/weblate/pull/19768\n\n### Resources\n\nThe issue was reported by @tonghuaroot via GitHub, and the same user also provided the initial patch.","published":"2026-06-10T19:56:37.829Z","modified":"2026-10-28T02:31:08.202408374Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.00308,"percentile":0.23595,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"weblate","fixedVersion":"2026.6"}],"fix":{"url":"https://github.com/WeblateOrg/weblate/pull/19768","label":"WeblateOrg/weblate#19768"},"references":[{"type":"WEB","url":"https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50127.json"},{"type":"ADVISORY","url":"https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50127"},{"type":"FIX","url":"https://github.com/WeblateOrg/weblate/pull/19768"},{"type":"PACKAGE","url":"https://github.com/WeblateOrg/weblate"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:08.202408374Z"}}