{"id":"CVE-2026-84288","state":"PUBLISHED","title":"NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service","description":"A vulnerability has been found in NousResearch hermes-agent up to 0.18.2. This affects the function HermesACPAgent.prompt of the file acp_adapter/session.py of the component ACP Prompt Workflow. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.","publishedAt":"2026-09-01T21:15:11.426Z","updatedAt":"2026-09-02T15:43:54.082Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","source":"VulDB"},"assigner":"VulDB","products":["NousResearch hermes-agent"],"affected":[{"vendor":"NousResearch","product":"hermes-agent","versions":[{"version":"0.18.0","status":"affected"},{"version":"0.18.1","status":"affected"},{"version":"0.18.2","status":"affected"}],"cpes":["cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*"],"modules":["ACP Prompt Workflow"]}],"references":["https://vuldb.com/vuln/397719","https://vuldb.com/vuln/397719/cti","https://vuldb.com/cve/CVE-2026-84288","https://vuldb.com/submit/882873","https://github.com/hackerguopeng/cve/tree/main/Hermes_ACP_Queued_Prompt_DoS_Report"],"weaknesses":["CWE-404"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/84xxx/CVE-2026-84288.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84288","state":"PUBLISHED","datePublished":"2026-09-01T21:15:11.426Z","dateUpdated":"2026-09-02T15:43:54.082Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-09-01T15:48:37.100Z"},"containers":{"cna":{"title":"NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service","descriptions":[{"lang":"en","value":"A vulnerability has been found in NousResearch hermes-agent up to 0.18.2. This affects the function HermesACPAgent.prompt of the file acp_adapter/session.py of the component ACP Prompt Workflow. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way."}],"affected":[{"vendor":"NousResearch","product":"hermes-agent","versions":[{"version":"0.18.0","status":"affected"},{"version":"0.18.1","status":"affected"},{"version":"0.18.2","status":"affected"}],"cpes":["cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*"],"modules":["ACP Prompt Workflow"]}],"references":[{"url":"https://vuldb.com/vuln/397719","name":"VDB-397719 | NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/vuln/397719/cti","name":"VDB-397719 | CTI Indicators (IOB, IOC, TTP, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/cve/CVE-2026-84288","name":"CVE-2026-84288 | CVE Analysis and Report","tags":["third-party-advisory"]},{"url":"https://vuldb.com/submit/882873","name":"Submit #882873 | NousResearch hermes-agent 0.18.2 Denial of Service","tags":["third-party-advisory"]},{"url":"https://github.com/hackerguopeng/cve/tree/main/Hermes_ACP_Queued_Prompt_DoS_Report","tags":["exploit"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":5.3,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","baseSeverity":"MEDIUM"}},{"cvssV3_1":{"version":"3.1","baseScore":4.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","baseSeverity":"MEDIUM"}},{"cvssV3_0":{"version":"3.0","baseScore":4.3,"vectorString":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","baseSeverity":"MEDIUM"}},{"cvssV2_0":{"version":"2.0","baseScore":4,"vectorString":"AV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-404","type":"CWE","lang":"en","description":"Denial of Service"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-09-01T21:15:11.426Z"},"timeline":[{"time":"2026-09-01T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-09-01T02:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-09-01T17:54:37.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"hackerguopeng (VulDB User)","type":"reporter"},{"lang":"en","value":"VulDB CNA Team","type":"coordinator"}],"x_generator":["VulDB PVTS v202609"]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T15:43:40.489348Z","id":"CVE-2026-84288","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-02T15:43:54.082Z"}}]}}}