CVE-2026-9351Disclosure

LOWCVSS 5.5 · MEDIUM

Exploitation ongoing with high activity in latest observed window (1 mentions)

Immediate actions

  • Prioritize remediation for affected systems immediately
  • Assume compromise if assets are exposed
  • Track advisory updates for patch or workaround availability

Recommended action window: Immediate (within 24h)

NVD description

A security flaw has been discovered in NousResearch hermes-agent up to 2026.4.16. This vulnerability affects the function _is_blocked_device of the file tools/file_tools.py of the component read_file Tool. Performing a manipulation results in path traversal. The attack may be initiated remotely. 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.

3.5/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-22

Priority

LOW

Exploitation

ACTIVE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • Active exploitation appears in 1 classified signals
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Active exploitation reported across 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-05-24); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-05-24: 1Mentions · 2026-05-27: 1Active Exploitation · 2026-05-27: 1Technical Details · 2026-05-24: 105-2405-27
Signal classification2 categories
Disclosure
150.0%
Active Exploitation
150.0%
Referenced assets2 URLs
By indicator
Classification over time
DateTotalLabels
2026-05-241
Disclosure1
2026-05-271
Active Exploitation1
Full discourse2 posts
  • VulDB 🛡@vuldb
    Active Exploitation

    Some increased actor activities are shown targeting NousResearch hermes-agent (CVE-2026-9351) https://vuldb.com/vuln/365314/cti

    Post summary

    The post indicates that attackers are increasingly targeting NousResearch's hermes-agent via CVE-2026-9351, implying active exploitation, but lacks detailed exploit or patch information.

    0101092
    2.2K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-9351 A security flaw has been discovered in NousResearch hermes-agent up to 2026.4.16. This vulnerability affects the function _is_blocked_device of the file tools/file_tool… https://www.cve.org/CVERecord?id=CVE-2026-9351

    Post summary

    A newly discovered vulnerability, CVE-2026-9351, in NousResearch's hermes-agent targets the _is_blocked_device function; no PoC, exploit, patch, or active exploitation is reported.

    00000238
    57.5K followersView on X

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