Low severity · published Oct 11, 2026
CVE-2026-108741
Shepherd through 0.3.1 SSRF via DNS Rebinding in Citation Checker
3.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SH
Shepherd · shepherd-agents
through 0.3.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-108741
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-108741
third-party-advisory
https://hackmd.io/@haind03/shepherd-citation-checker-dns-rebinding-ssrf
technical-description
https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/network.py#L9-L17
technical-description
https://github.com/shepherd-agents/shepherd/blob/d34d5ca334871dfcb5a3dc76dd78045829fa4e56/shepherd/extras/citation-checker/src/shepherd_citation_checker/_engine/fetch.py#L34-L55
product
https://github.com/shepherd-agents/shepherd
third-party-advisory
https://www.vulncheck.com/advisories/shepherd-through-0.3.1-ssrf-via-dns-rebinding-in-citation-checker