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CVE-2026-29178

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. Prior to version 0.19.16, the GET /api/v4/image/{filename} endpoint is vulnerable to unauthenticated SSRF through parameter injection in the file_type query parameter. An attacker can inject arbitrary query parameters into the internal request to pict-rs, including the proxy parameter which causes pict-rs to
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eccc5817d84c40b145fc65c6228e8278efe02cafd971f3fb91089449135af674
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":"< 0.19.16"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:803728100fd5a58cf0d549b1e829f43f12d6c0af02e8f2694e3329e48a93d5e1 · sha256:860111846c4a7650… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:803728100fd5a58cf0d549b1e829f43f12d6c0af02e8f2694e3329e48a93d5e1 · sha256:860111846c4a7650… · /containers/cna/metrics/0/cvssV4_0

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:v2:803728100fd5a58cf0d549b1e829f43f12d6c0af02e8f2694e3329e48a93d5e1 · sha256:860111846c4a7650… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/LemmyNet/lemmy/commit/f47a03f56d1797bceab5f34b6f624c91cecd5871","tags":["x_refsource_MISC"],"url":"https://github.com/LemmyNet/lemmy/commit/f47a03f56d1797bceab5f34b6f624c91cecd5871"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:803728100fd5a58cf0d549b1e829f43f12d6c0af02e8f2694e3329e48a93d5e1 · sha256:860111846c4a7650… · /containers/cna/references/1
{"name":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:803728100fd5a58cf0d549b1e829f43f12d6c0af02e8f2694e3329e48a93d5e1 · sha256:860111846c4a7650… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-jvxv-2jjp-jxc3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:803728100fd5a58cf0d549b1e829f43f12d6c0af02e8f2694e3329e48a93d5e1 · sha256:860111846c4a7650… · /containers/adp/0/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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