CVE Explorer

CVE-2026-33693

Lemmy is a link aggregator and forum for the fediverse. Prior to version 0.7.0-beta.9, the `v4_is_invalid()` function in `activitypub-federation-rust` (`src/utils.rs`) does not check for `Ipv4Addr::UNSPECIFIED` (0.0.0.0). An unauthenticated attacker controlling a remote domain can point it to 0.0.0.0, bypass the SSRF protection introduced by the fix for CVE-2025-25194 (GHSA-7723-35v7-qcxw), and reach localhost services on the target server. Version 0.7.0-beta.9 patches the issue.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:28e0c4b98a2fd2d56b3df2ef7d93e747edff6b5ad7184294af3187afbfda60aa

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"lemmy","vendor":"LemmyNet","versions":[{"status":"affected","version":"< 0.7.0-beta.9"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ea1a5d8bbe1238def1b715d25e22173361113b917892cc0f8e3044f5dc4b02e7 · sha256:ef08d258a246faa7… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:ea1a5d8bbe1238def1b715d25e22173361113b917892cc0f8e3044f5dc4b02e7 · sha256:ef08d258a246faa7… · /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:ea1a5d8bbe1238def1b715d25e22173361113b917892cc0f8e3044f5dc4b02e7 · sha256:ef08d258a246faa7… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/LemmyNet/activitypub-federation-rust/commit/4ae8532b17bc35755240b7f55d4a5b7665351599","tags":["x_refsource_MISC"],"url":"https://github.com/LemmyNet/activitypub-federation-rust/commit/4ae8532b17bc35755240b7f55d4a5b7665351599"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ea1a5d8bbe1238def1b715d25e22173361113b917892cc0f8e3044f5dc4b02e7 · sha256:ef08d258a246faa7… · /containers/cna/references/1

{"name":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-q537-8fr5-cw35","tags":["x_refsource_CONFIRM"],"url":"https://github.com/LemmyNet/lemmy/security/advisories/GHSA-q537-8fr5-cw35"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ea1a5d8bbe1238def1b715d25e22173361113b917892cc0f8e3044f5dc4b02e7 · sha256:ef08d258a246faa7… · /containers/cna/references/0

{"name":"https://github.com/advisories/GHSA-7723-35v7-qcxw","tags":["x_refsource_MISC"],"url":"https://github.com/advisories/GHSA-7723-35v7-qcxw"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ea1a5d8bbe1238def1b715d25e22173361113b917892cc0f8e3044f5dc4b02e7 · sha256:ef08d258a246faa7… · /containers/cna/references/2

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.

← Back to CVE Explorer