VulnerabilityDeferred

CVE-2025-25194

Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypub_federation, a framework for ActivityPub federation in Rust.

MEDIUM 4.0EPSS 0.42%

Does this matter?

Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own.

Description

Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypub_federation, a framework for ActivityPub federation in Rust. This vulnerability, which is present in versions 0.6.2 and prior of activitypub_federation and versions 0.19.8 and prior of Lemmy, 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. As of time of publication, a fix has not been made available.

CVSS 3.1: 4.0 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
EPSS: 0.42% probability · 36th percentile
CISA KEV: Not listed
Weakness: CWE-918
Source: security-advisories@github.com

References

https://github.com/LemmyNet/lemmy/security/advisories/GHSA-7723-35v7-qcxw

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.