CVE-2026-42181
medium
CVSS v3
6.5
CVSS v4 NEW
—
VIR risk
6.5
Description
Lemmy has SSRF and internal image disclosure in post link metadata via unvalidated og:image
Predictions
Exploit likelihood
75%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| crates.io | lemmy_api_common | <0.19.18 | 0.19.18 |
| RUST | lemmy_api_common | < 0.19.18 | 0.19.18 |
References
- https://github.com/LemmyNet/lemmy/releases/tag/0.19.18
- https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq
- https://nvd.nist.gov/vuln/detail/CVE-2026-42181
- https://github.com/LemmyNet/lemmy/commit/9ffe586dafac1a46acf17edf90e0165e5503b2f1
- https://github.com/LemmyNet/lemmy
- https://join-lemmy.org/news/2026-04-20_-_Lemmy_Release_v0.19.18
- https://github.com/advisories/GHSA-h6hf-9846-xwrq
CWEs
CWE-918
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.