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CVE-2026-9366

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:156cf9d2d420ba79349cda60af6a2c966e642a2b663c6d23cdfb612b586320a7
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 4 assertions

{"metric":{"baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/2/cvssV3_0

{"metric":{"baseScore":7.5,"vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR","version":"2.0"},"metric_type":"cvssV2_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/3/cvssV2_0

{"metric":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/1/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-74","description":"Injection","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-707","description":"Improper Neutralization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"cpes":["cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*"],"product":"hermes-agent","vendor":"NousResearch","versions":[{"status":"affected","version":"2026.4.23"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/affected/0

Provider-owned CVSS observations

4 source assertions
{"metric":{"baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/2/cvssV3_0
{"metric":{"baseScore":7.5,"vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR","version":"2.0"},"metric_type":"cvssV2_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/3/cvssV2_0
{"metric":{"baseScore":7.3,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-74","description":"Injection","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-707","description":"Improper Neutralization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"tags":["exploit"],"url":"https://gist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75cc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/references/3
{"name":"Submit #812227 | NousResearch hermes-agent 2026.4.23 Injection (CWE-74)","tags":["third-party-advisory"],"url":"https://vuldb.com/submit/812227"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/references/2
{"name":"VDB-365329 | NousResearch hermes-agent prompt_builder.py _scan_context_content injection","tags":["vdb-entry","technical-description"],"url":"https://vuldb.com/vuln/365329"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/references/0
{"name":"VDB-365329 | CTI Indicators (IOB, IOC, TTP, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/vuln/365329/cti"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e2421350f96c176e5d5e208e3ee2bd8b748f8cbda131ef3e72fb03a8467e1448 · sha256:de15bd94c7ee7c39… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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