CVE-2026-9366

NousResearch hermes-agent prompt_builder.py _scan_context_content injection

CVSS 6.9 MEDIUMEPSS 0.3%CWE-707 CWE-74

Vexday Risk Score

33Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 6.9EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

24 May 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

A vulnerability was found in NousResearch hermes-agent 2026.4.23. The impacted element is the function _scan_context_content of the file agent/prompt_builder.py. The manipulation results in injection. The attack may be performed from remote. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Affected products

NousResearch · hermes-agent

public PoCs found — 1

cve_referencegist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75ccunverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

References

https://gist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75cc https://vuldb.com/submit/812227 https://vuldb.com/vuln/365329 https://vuldb.com/vuln/365329/cti