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CVE-2026-50127
Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)
Medium5.9EPSS 0.31%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Deferred | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.31% · top 76% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
- affected >= 5.15, < 2026.6
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPIweblateGHSA-vmfc-9982-2m45 (opens in a new tab)
References (3)
- https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/WeblateOrg/weblate/pull/19768 (opens in a new tab)x_refsource_MISC
- https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-vmfc-9982-2m45 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-50127)Record last updated .