Server-Side Request Forgery Vulnerability in NousResearch Hermes Agent
CVE-2026-18774

5.3MEDIUM

Key Information:

Vendor

Nousresearch

Status
Hermes-agent
Vendor
CVE Published:
4 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18774?

A vulnerability exists in NousResearch's hermes-agent up to version 0.16.0, specifically within the save_url_image function in the xAI Image Generation Provider. This flaw allows for server-side request forgery (SSRF), potentially enabling attackers to initiate remote exploits. Despite early notification of the vulnerability to the vendor, no response was received, posing significant risks to users dependent on this software.

Affected Version(s)

hermes-agent 0.1

hermes-agent 0.2

hermes-agent 0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-18774 - Proof of Concept

References

https://vuldb.com/vuln/385784
vdb-entrytechnical-description
https://vuldb.com/vuln/385784/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18774
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-y (VulDB User)
VulDB CNA Team
.