{"answers":{"affected":"2 open source packages ship an affected version, including activitypub_federation.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33693 exists.","fix":"Upgrade activitypub_federation to 0.7.0-beta.9 or later.","what":"CVE-2026-33693 is a medium-severity vulnerability in LemmyNet lemmy, published on 27 Mar 2026."},"fix_prompt":"Check this codebase for CVE-2026-33693 and fix it if it is affected.\n\nWhat it is: CVE-2026-33693 is a medium-severity vulnerability in LemmyNet lemmy, published on 27 Mar 2026. \nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33693 exists.\n\nAffected packages and fixed versions:\n- activitypub_federation (crates.io): affected all versions; fixed in 0.7.0-beta.9\n- activitypub_federation (crates.io): affected all versions; fixed in 0.7.0-beta.9\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-33693/ (Markdown: https://insights.sbomify.com/CVE-2026-33693/index.md)","id":"CVE-2026-33693","markdown":"https://insights.sbomify.com/CVE-2026-33693/index.md","name":"CVE-2026-33693","record":{"aliases":["GHSA-q537-8fr5-cw35"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-918","name":"Server-Side Request Forgery"}],"description":"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.","ecosystems":["crates.io"],"exploits":{"exploitdb":0,"first_seen":"2026-03-23","github_poc":1,"max_poc_stars":2,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-03-23T23:00:03Z","kind":"github_poc","ref":"https://github.com/SnailSploit/CVE-2026-33693","stars":2,"title":"CVE-2026-33693: SSRF via 0.0.0.0 Bypass in activitypub-federation-rust v4_is_invalid() (CVSS 6.5 Moderate)"}],"tier":"weaponised"},"has_fix":true,"headline":"Lemmy's Activitypub-Federation has SSRF via 0.0.0.0 bypass in activitypub-federation-rust v4_is_invalid()","id":"CVE-2026-33693","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":null,"year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Junction File Manipulation","id":"CVE-2026-33694"},"packages":[{"ecosystem":"crates.io","fixed":["0.7.0-beta.9"],"introduced":["0"],"last_affected":[],"package":"activitypub_federation","purl":null,"source":"GHSA-q537-8fr5-cw35"},{"ecosystem":"crates.io","fixed":["0.7.0-beta.9"],"introduced":["0"],"last_affected":[],"package":"activitypub_federation","purl":"pkg:cargo/activitypub_federation","source":"GHSA-q537-8fr5-cw35"}],"prev":{"headline":"AVideo Has Unauthenticated .env File Exposure via Official Docker Compose Configuration","id":"CVE-2026-33692"},"products":["lemmy"],"published":"2026-03-27","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-30","vendors":["LemmyNet"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-33693/"}