Server-Side Request Forgery (SSRF) in activitypub_federation

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.0 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

EPSS

• CVE-2025-25194: 0.42% estimated exploitation activity in the next 30 days; percentile 36.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary This vulnerability allows a user to bypass any predefined hardcoded URL path or security anti-Localhost mechanism and perform an arbitrary GET request to any Host, Port and URL using a Webfinger Request. Details The Webfinger endpoint takes a remote domain for checking accounts as a feature, however, as per the ActivityPub spec (https://www.w3.org/TR/activitypub/#security-considerations), on the security considerations section at B.3, access to Localhost services should be prevented while running in production. The library attempts to prevent Localhost access using the following mechanism (/src/config.rs): There are multiple issues with the current anti-Localhost implementation: 1. It does not resolve the domain address supplied by the user. 2. The Localhost check is using only a simple comparison method while ignoring more complex malicious tampering attempts. 3. It filters only localhost domains, without any regard for alternative local IP domains or other sensitive…

Published by the source

10 Feb 2025, 20:25 UTC

Last modified by the source

11 Feb 2025, 00:33 UTC

Source last checked

26 Oct 2026, 15:38 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7723-35v7-qcxw

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# Patch Next advisory brief: CVE-2025-25194

Advisory: Server-Side Request Forgery (SSRF) in activitypub_federation
IDs: CVE-2025-25194, GHSA-7723-35v7-qcxw
Record: https://patchnext.com/advisories/cve-2025-25194 (revision 1, source checked 26 Oct 2026, 15:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io activitypub_federation: affected <= 0.6.2

## Suggested inspection (read-only)
- crates.io activitypub_federation: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on activitypub_federation.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-7723-35v7-qcxw (GitHub-reviewed advisory GHSA-7723-35v7-qcxw lists affected ranges: crates.io activitypub_federation >=0 <=0.6.2)

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