Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the IPv4 validation logic present starting in version 0.11.2 and prior to versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 appears incomplete. The `validatePublicUrl()` protection relies on `isValidPublicIPv4Address()` to reject non-public IPv4 destinations. The function blocks common private and local ranges such as `10.0.0.0/8`, `127.0.0.0/8`, `169.254.0.0/16`, `172.16.0.0/12`, and `192.168.0.0/16`, but it still treats several special-use, reserved, multicast, benchmarking, and carrier-grade NAT IPv4 ranges as valid public destinations. Because this validation is used as an SSRF defense before outbound fetches, this appears to be an incomplete mitigation or bypass class for the previous SSRF issue. Versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 contain an updated patch.
References
Configurations
No configuration.
History
11 Jun 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/fedify-dev/fedify/security/advisories/GHSA-xw9q-2mv6-9fr8 - |
10 Jun 2026, 22:17
| Type | Values Removed | Values Added |
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| New CVE |
Information
Published : 2026-06-10 22:17
Updated : 2026-06-11 16:16
NVD link : CVE-2026-50131
Mitre link : CVE-2026-50131
CVE.ORG link : CVE-2026-50131
JSON object : View
Products Affected
No product.