CVE-2026-62857

Fedify: Server-Side Request Forgery in getNodeInfo() Allows Access to Internal Network Resources

State: Published
Severity: 8.8 High
Published: Aug 6, 2026
Updated: Aug 8, 2026
Reserved: Jul 14, 2026

Description

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. From version 1.2.0 through the affected 1.9, 1.10, 2.0, 2.1, 2.2, and 2.3 maintenance lines, getNodeInfo() follows an attacker-controlled links[].href value from /.well-known/nodeinfo without scheme, redirect, or private-address validation, allowing requests to loopback, link-local, cloud metadata, and private-network services and returning their response bodies. This issue is fixed in versions 1.9.13, 1.10.12, 2.0.22, 2.1.18, 2.2.7, and 2.3.2.

Scores

CVSS	Score	Vector	Source
4.0	8.8 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
fedifyfedify-dev	>= 1.2.0, < 1.9.13Affected >= 1.10.0, < 1.10.12Affected >= 2.0.0, < 2.0.22Affected >= 2.1.0, < 2.1.18Affected >= 2.2.0, < 2.2.7Affected >= 2.3.0, < 2.3.2Affected

References

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