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2.3

Shepherd 0.3.1 may expose internal services via crafted links

CVE-2026-108741 · published 7 days ago
Summary

The citation-checker feature in Shepherd 0.3.1 can be tricked into contacting internal web services when an attacker supplies a specially crafted URL and controls its DNS records. This lets the attacker retrieve data from internal systems and store it in the evidence files. Upgrade Shepherd to the latest version or apply the vendor's patch and avoid processing untrusted citation URLs.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
shepherd-agents shepherd <= 0.3.1
Original advisory text
Shepherd through 0.3.1 SSRF via DNS Rebinding in Citation Checker
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
2.3 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
Timeline
Published11 Oct 2026
Updated16 Oct 2026
First seen11 Oct 2026
Sources
CVE-2026-108741 · NVD
CVE-2026-108741 · MITRE
CVE-2026-108741 · OSV
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