Is activitypub_federation affected by CVE-2026-33693?

crates.io activitypub_federation is affected in <0.7.0-beta.9.

Is CVE-2026-33693 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

medium

CVE-2026-33693

Q: Is CVE-2026-33693 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

crates.io · activitypub_federation

Summary

Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()

Severity: medium
EPSS: 0.4% (p28)
Also known as: GHSA-q537-8fr5-cw35
Published: 2026-03-25

References

https://github.com/LemmyNet/lemmy/security/advisories/GHSA-q537-8fr5-cw35
https://nvd.nist.gov/vuln/detail/CVE-2026-33693
https://github.com/LemmyNet/activitypub-federation-rust/commit/4ae8532b17bc35755240b7f55d4a5b7665351599

Related advisories

CVE-2025-25194 — medium · crates.io/activitypub_federation

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.