{"id":"CVE-2026-108741","published":"2026-10-11T13:17:18.673","lastModified":"2026-10-16T19:18:44.867","description":"Shepherd (shepherd-ai) through 0.3.1 contains a server-side request forgery guard bypass in the citation-checker extra because the public_url guard validates a resolved address but fetch re-resolves the hostname at connect time. Attackers who plant a crafted reference URL in a checked document and control its DNS can rebind it to internal addresses, sending GET requests to internal HTTP(S) services and capturing responses in evidence files.","cvssScore":3.1,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","cwes":["CWE-367"],"vendors":[],"products":[],"references":[{"url":"https://github.com/shepherd-agents/shepherd","tags":[]},{"url":"https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/fetch.py#L34-L55","tags":[]},{"url":"https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/network.py#L9-L17","tags":[]},{"url":"https://hackmd.io/@haind03/shepherd-citation-checker-dns-rebinding-ssrf","tags":[]},{"url":"https://www.vulncheck.com/advisories/shepherd-through-0.3.1-ssrf-via-dns-rebinding-in-citation-checker","tags":[]}],"exploitRefs":[{"url":"https://github.com/shepherd-agents/shepherd","tags":[]},{"url":"https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/fetch.py#L34-L55","tags":[]},{"url":"https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/network.py#L9-L17","tags":[]}],"hasPoc":true,"ai":null}