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Medium

OpenClaw before 2026.8.1 Policy Bypass via Session Filename Generation

Type: advisorySources: OSV

OpenClaw (npm package `openclaw`) before 2026.8.1 incorrectly enforces sender tool policies during session-memory filename generation. In affected versions, filename generation created an embedded helper that retained tools which the originating sender's policy had removed. When session-memory filename generation was enabled for an agent reachable by lower-trust senders, model-mediated instructions could cause the helper to invoke tools outside that sender's effective policy; the demonstrated impact was the creation of persistent scheduled work. Exploitability depends on the model acting on the injected instruction and on which tools the helper exposes. The issue is fixed in 2026.8.1; as a workaround, disable session-memory filename generation for agents reachable by lower-trust senders.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100545
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 20:03 UTC · Revision 1

Source evidence

OpenClaw before 2026.8.1 Policy Bypass via Session Filename Generation

core-osv · Original source

Published 26 Sept 2026, 02:18 UTC

OpenClaw (npm package `openclaw`) before 2026.8.1 incorrectly enforces sender tool policies during session-memory filename generation. In affected versions, filename generation created an embedded helper that retained tools which the originating sender's policy had removed. When session-memory filename generation was enabled for an agent reachable by lower-trust senders, model-mediated instructions could cause the helper to invoke tools outside that sender's effective policy; the demonstrated impact was the creation of persistent scheduled work. Exploitability depends on the model acting on the injected instruction and on which tools the helper exposes. The issue is fixed in 2026.8.1; as a workaround, disable session-memory filename generation for agents reachable by lower-trust senders.

osv:CVE-2026-100545
Complete source record
{
  "id": "290ab6d36196005e01446a22999e59fc8f1c4ca305f22857b7f16b1cd565f2a0",
  "url": "https://osv.dev/vulnerability/CVE-2026-100545",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenClaw before 2026.8.1 Policy Bypass via Session Filename Generation",
    "summary": "OpenClaw (npm package `openclaw`) before 2026.8.1 incorrectly enforces sender tool policies during session-memory filename generation. In affected versions, filename generation created an embedded helper that retained tools which the originating sender's policy had removed. When session-memory filename generation was enabled for an agent reachable by lower-trust senders, model-mediated instructions could cause the helper to invoke tools outside that sender's effective policy; the demonstrated impact was the creation of persistent scheduled work. Exploitability depends on the model acting on the injected instruction and on which tools the helper exposes. The issue is fixed in 2026.8.1; as a workaround, disable session-memory filename generation for agents reachable by lower-trust senders.",
    "evidence": "osv:CVE-2026-100545",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100545",
      "aliases": [
        "CVE-2026-100545",
        "GHSA-5fwv-rrvp-8xvr"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openclaw/openclaw",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ea806575e6450e4d1efdfc72c19f04be982a1b9b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
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      "modified": "2026-10-28T02:30:23.281140776Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100545.json",
        "https://github.com/openclaw/openclaw/security/advisories/GHSA-5fwv-rrvp-8xvr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100545",
        "https://www.vulncheck.com/advisories/openclaw-before-2026.8.1-policy-bypass-via-session-filename-generation"
      ],
      "provider_metadata": {
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        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100545.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-100545",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489567,
  "published_at": "2026-09-26T02:18:41.92+00:00"
}