Vulnerability-Lookup

GHSA-8F9R-GR6R-X63Q

Vulnerability from github – Published: 2026-04-10 00:30 – Updated: 2026-04-10 00:30

Details

OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated attackers to force resource-intensive parsing operations. Remote attackers can send malicious webhook requests to trigger denial of service by exhausting server resources through forced JSON parsing before signature rejection.

Severity ?

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                  
                    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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-35640"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-696"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-09T22:16:33Z",
    "severity": "MODERATE"
  },
  "details": "OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated attackers to force resource-intensive parsing operations. Remote attackers can send malicious webhook requests to trigger denial of service by exhausting server resources through forced JSON parsing before signature rejection.",
  "id": "GHSA-8f9r-gr6r-x63q",
  "modified": "2026-04-10T00:30:30Z",
  "published": "2026-04-10T00:30:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35640"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-35640 (GCVE-0-2026-35640)

Vulnerability from cvelistv5 – Published: 2026-04-09 21:27 – Updated: 2026-04-10 12:29 X_Open Source

Title

OpenClaw < 2026.3.25 - Denial of Service via Unauthenticated Webhook Request Parsing

Summary

Severity ?

6.9 (Medium)


                        
                          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

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-696 - Incorrect Behavior Order

Assigner

VulnCheck

References

URL

Tags

	https://github.com/openclaw/openclaw/security/adv…	third-party-advisory
	https://github.com/openclaw/openclaw/commit/5e8cb…	patch
	https://www.vulncheck.com/advisories/openclaw-den…	third-party-advisory

Impacted products

	Vendor	Product	Version
	OpenClaw	OpenClaw	Affected: 0 , < 2026.3.25 (semver) Unaffected: 2026.3.25 (semver)

Date Public ?

2026-03-26 00:00

Credits

tdjackey

Show details on NVD website

JSON

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  "containers": {
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      {
        "metrics": [
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                "id": "CVE-2026-35640",
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-10T12:25:51.531666Z",
                "version": "2.0.3"
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
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              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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        }
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      "metrics": [
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
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    "datePublished": "2026-04-09T21:27:08.792Z",
    "dateReserved": "2026-04-04T12:30:33.464Z",
    "dateUpdated": "2026-04-10T12:29:52.811Z",
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  },
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-8F9R-GR6R-X63Q

CVE-2026-35640 (GCVE-0-2026-35640)

Tags

Sightings

Nomenclature