What is CVE-2026-42181?

CVE-2026-42181 is a medium-severity vulnerability in Lemmynet Lemmy, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-05-08.

How severe is CVE-2026-42181?

Medium severity. CVSS v3 base score is 6.5 out of 10.

SSRF in Lemmynet Lemmy

CVE-2026-42181

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.19.18, Lemmy fetches metadata for user-supplied post URLs and, under the default StoreLinkPreviews image mode, downloads the preview image through local pict-rs. Wh…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (9.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Lemmynet Lemmy — versions < 0.19.18

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-42181?: CVE-2026-42181 is a medium-severity vulnerability in Lemmynet Lemmy, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-05-08.
How severe is CVE-2026-42181?: Medium severity. CVSS v3 base score is 6.5 out of 10.