Medium Denial of service exploit reference

CVE-2026-14626 — NousResearch hermes-agent HTTP API run_agent.py AIAgent.run_conversation denial of service

A weakness has been identified in NousResearch hermes-agent up to 2026.4.30. The impacted element is the function AIAgent.run_conversation of the file run_agent.py of the component HTTP API. This manipulation of the argument todos causes denial of service. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Published Jul 4, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (medium)+3
CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

NousResearch

Hermes-agent

CVSS base

4.3

Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (NousResearch Hermes-agent).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
NousResearch	Hermes-agent	version 2026.4.15version 2026.4.30version 2026.4.29version 2026.4.28version 2026.4.27version 2026.4.26version 2026.4.25version 2026.4.24 and 23 more version 2026.4.23version 2026.4.22version 2026.4.21version 2026.4.20version 2026.4.19version 2026.4.18version 2026.4.17version 2026.4.16version 2026.4.0version 2026.4.14version 2026.4.13version 2026.4.12version 2026.4.11version 2026.4.10version 2026.4.9version 2026.4.8version 2026.4.7version 2026.4.6version 2026.4.5version 2026.4.4version 2026.4.3version 2026.4.2version 2026.4.1	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.3	CVSS 4.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
2.1	CVSS 4.0	Low	—	—	cna@vuldb.com via NIST National Vulnerability Database
4.3	CVSS 3.1	Medium	2.8	1.4	cna@vuldb.com via NIST National Vulnerability Database
4.3	CVSS 3.1	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
4.3	CVSS 3.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
4.0	CVSS 2.0	Medium	8.0	2.9	cna@vuldb.com via NIST National Vulnerability Database
4.0	CVSS 2.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-404 · Improper Resource Shutdown or Release

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Track CPU/memory spikes and availability drops correlated with request patterns.

web/proxy/WAF logsnetwork IDS/IPSresource metrics

Timeline

What happened to this CVE, newest first.

2026
Affected products added · nousresearch/hermes-agent
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 4.3
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Jul 4, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

5 on the record

vuldb.com/submit/845596
third-party-advisory, NIST National Vulnerability Database
vuldb.com/vuln/376142/cti
signature, permissions-required, NIST National Vulnerability Database
vuldb.com/vuln/376142
vdb-entry, technical-description, NIST National Vulnerability Database
vuldb.com/cve/CVE-2026-14626
third-party-advisory, NIST National Vulnerability Database
gist.github.com/YLChen-007/b91a85f9448beadebe25d37a3f4fd760
exploit, NIST National Vulnerability Database

Elsewhere on this site

NousResearch
every CVE for this vendor

Denial of service
same class

CWE-404
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-71963 Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection Sep 3, 2026
High CVE-2026-85105 NousResearch hermes-agent Session Management s71.py _sess_nowait authorization Sep 3, 2026
Medium CVE-2026-85106 NousResearch hermes-agent Link Title Fetch index.tsx fetchLinkTitle server-side request forgery Sep 3, 2026
Medium CVE-2026-85107 NousResearch hermes-agent Electron Main Process main.ts resourceBufferFromUrl allocation of resources Sep 3, 2026
Medium CVE-2026-84288 NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service Sep 1, 2026
Medium CVE-2026-84289 NousResearch hermes-agent MCP Tool mcp_tool.py list_tools memory allocation Sep 1, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-14626 is "NousResearch hermes-agent HTTP API run_agent.py AIAgent.run_conversation denial of service", rated Medium. It affects Hermes-agent (NousResearch); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.3 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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