CVE-2026-108741 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in the Shepherd citation checker component, affecting versions through 0.3.1. The vulnerability arises because the public_url guard, which is supposed to validate and restrict URLs to public addresses, is bypassed. This occurs when the citation checker fetches references from documents that contain crafted URLs. If an attacker controls the DNS for these URLs, they can redirect requests to internal services, potentially exposing sensitive information or functionality.
The vulnerability can be remediated by modifying the public_url guard to return the validated addresses, allowing the fetch function to connect directly to the approved address without re-resolving the hostname. This change should be applied in the Shepherd citation checker component.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 11, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-367 | Time-of-check Time-of-use (TOCTOU) Race Condition | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Shepherd | <= 0.3.1 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 11, 2026 | New CVE Received | [email protected] |