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Medium

OpenClaw before 2026.8.2 Denial of Service via Browser Relay

Type: advisorySources: OSV

OpenClaw before 2026.8.2 contains a denial of service vulnerability in the Browser extension relay that allows unauthenticated network sources to exhaust pending-authentication capacity. Attackers can hold every pending slot by maintaining silent WebSocket upgrades, preventing paired extensions from completing Browser Relay Authentication v2.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100527
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 15:00 UTC · Revision 1

Source evidence

OpenClaw before 2026.8.2 Denial of Service via Browser Relay

core-osv · Original source

Published 26 Sept 2026, 02:18 UTC

OpenClaw before 2026.8.2 contains a denial of service vulnerability in the Browser extension relay that allows unauthenticated network sources to exhaust pending-authentication capacity. Attackers can hold every pending slot by maintaining silent WebSocket upgrades, preventing paired extensions from completing Browser Relay Authentication v2.

osv:CVE-2026-100527
Complete source record
{
  "id": "4955ee69df27fdef770269f154bc9157b5ffa41fa48d7a358003f3dce50fa120",
  "url": "https://osv.dev/vulnerability/CVE-2026-100527",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenClaw before 2026.8.2 Denial of Service via Browser Relay",
    "summary": "OpenClaw before 2026.8.2 contains a denial of service vulnerability in the Browser extension relay that allows unauthenticated network sources to exhaust pending-authentication capacity. Attackers can hold every pending slot by maintaining silent WebSocket upgrades, preventing paired extensions from completing Browser Relay Authentication v2.",
    "evidence": "osv:CVE-2026-100527",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100527",
      "aliases": [
        "CVE-2026-100527",
        "GHSA-m78m-7h3q-q938"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openclaw/openclaw",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0965053fe6b9341776df147a6934b7485c60b5ca"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "2026.8.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
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                      {
                        "fixed": "2026.8.2"
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                    "source": "DESCRIPTION"
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      "modified": "2026-10-28T02:30:29.956656742Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100527.json",
        "https://github.com/openclaw/openclaw/security/advisories/GHSA-m78m-7h3q-q938",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100527",
        "https://www.vulncheck.com/advisories/openclaw-before-2026.8.2-denial-of-service-via-browser-relay"
      ],
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        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100527.json"
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    "related_cves": [
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        "value": "CVE-2026-100527",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496630,
  "published_at": "2026-09-26T02:18:29.745+00:00"
}