{"id":"CVE-2026-108741","summary":"Shepherd through 0.3.1 SSRF via DNS Rebinding in Citation Checker","details":"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.","modified":"2026-10-15T02:30:59.511563920Z","published":"2026-10-11T12:19:45.494Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108741.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-367"]},"references":[{"type":"WEB","url":"https://pypi.org"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108741.json"},{"type":"ADVISORY","url":"https://hackmd.io/@haind03/shepherd-citation-checker-dns-rebinding-ssrf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-108741"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/shepherd-through-0.3.1-ssrf-via-dns-rebinding-in-citation-checker"},{"type":"PACKAGE","url":"https://github.com/shepherd-agents/shepherd"},{"type":"ARTICLE","url":"https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/fetch.py#L34-L55"},{"type":"ARTICLE","url":"https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/network.py#L9-L17"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/shepherd-agents/shepherd","events":[{"introduced":"0"},{"fixed":"d34d5ca334871dfcb5a3dc76dd78045829fa4e56"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0.3.1"},{"fixed":"0.3.1"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v0.3.0","v0.2.1","v0.2.0","v0.1.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108741.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}