EUVD-2026-33555
GHSA-mv8x-fg99-32mf
Severity by source
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
A security flaw has been discovered in NousResearch hermes-agent up to 2026.4.30. Affected by this issue is the function _sanitize_env_lines of the file hermes_cli/config.py. The manipulation results in injection. It is possible to launch the attack remotely. The attack requires a high level of complexity. The exploitation is known to be difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
Injection vulnerability in NousResearch hermes-agent (all versions through 2026.4.30) allows remote unauthenticated attackers to exploit improper neutralization in the _sanitize_env_lines function of hermes_cli/config.py, achieving partial confidentiality, integrity, and availability impact. The flaw is tagged as code injection (CWE-74), meaning attacker-controlled input passed through this sanitization routine may reach a downstream component in an executable or interpreted context. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attack requires network access to an interface that accepts input processed by the hermes_cli configuration layer, specifically the _sanitize_env_lines function in hermes_cli/config.py. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.6 (Medium) reflects a balanced picture: network reachability (AV:N) and no authentication requirement (PR:N/UI:N) lower the barrier to access, but high attack complexity (AC:H) and unchanged scope (S:U) with only low-level impacts across all three impact pillars (C:L/I:L/A:L) cap the ceiling. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker with knowledge of the hermes-agent configuration input surface crafts a malicious environment variable line containing injection characters (e.g., newline sequences, shell metacharacters, or delimiter escapes) and submits it to the application through a network-accessible pathway. The _sanitize_env_lines function in hermes_cli/config.py fails to neutralize these sequences before passing them to a downstream component - such as a subprocess, file writer, or interpreter - resulting in partial code execution, configuration tampering, or service disruption. … |
| Remediation | No vendor-released patch identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Share
External POC / Exploit Code
Leaving vuln.today