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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. While the top-level page URL is checked against internal IP ranges, the extracted og:image URL is not subject to the same restriction. As a result, an authenticated low-privileged user can submit an attacker-controlled public page whose Open Graph image points to
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4778b214f4de03aa41df0342293a7cf3e3986363c62f5bd0c63d11345c4a3608
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"lemmy","vendor":"LemmyNet","versions":[{"status":"affected","version":"< 0.19.18"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0a5c1cba00a3ac3a51f262d281770d844f8cbdeb85e26e7fbba9e0f6904308d3 · sha256:c42377933bd91c91… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0a5c1cba00a3ac3a51f262d281770d844f8cbdeb85e26e7fbba9e0f6904308d3 · sha256:c42377933bd91c91… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0a5c1cba00a3ac3a51f262d281770d844f8cbdeb85e26e7fbba9e0f6904308d3 · sha256:c42377933bd91c91… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/LemmyNet/lemmy/releases/tag/0.19.18","tags":["x_refsource_MISC"],"url":"https://github.com/LemmyNet/lemmy/releases/tag/0.19.18"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0a5c1cba00a3ac3a51f262d281770d844f8cbdeb85e26e7fbba9e0f6904308d3 · sha256:c42377933bd91c91… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0a5c1cba00a3ac3a51f262d281770d844f8cbdeb85e26e7fbba9e0f6904308d3 · sha256:c42377933bd91c91… · /containers/adp/0/references/0
{"name":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-h6hf-9846-xwrq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0a5c1cba00a3ac3a51f262d281770d844f8cbdeb85e26e7fbba9e0f6904308d3 · sha256:c42377933bd91c91… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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