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Vulnerability details: VCID-2amg-4khy-1ufr
Vulnerability ID VCID-2amg-4khy-1ufr
Aliases CVE-2026-35640
GHSA-3h52-cx59-c456
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-696 Incorrect Behavior Order
CWE-400 Uncontrolled Resource Consumption
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00127 https://api.first.org/data/v1/epss?cve=CVE-2026-35640
epss 0.00127 https://api.first.org/data/v1/epss?cve=CVE-2026-35640
epss 0.00127 https://api.first.org/data/v1/epss?cve=CVE-2026-35640
epss 0.00127 https://api.first.org/data/v1/epss?cve=CVE-2026-35640
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-3h52-cx59-c456
cvssv4 6.9 https://github.com/openclaw/openclaw
generic_textual MODERATE https://github.com/openclaw/openclaw
cvssv3.1 5.3 https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
cvssv4 6.9 https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
generic_textual MODERATE https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
ssvc Track https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
cvssv3.1 5.3 https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
cvssv3.1_qr MODERATE https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
cvssv4 6.9 https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
generic_textual MODERATE https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
ssvc Track https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
cvssv4 6.9 https://nvd.nist.gov/vuln/detail/CVE-2026-35640
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-35640
cvssv3.1 5.3 https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
cvssv4 6.9 https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
generic_textual MODERATE https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
ssvc Track https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-35640
https://github.com/openclaw/openclaw
https://nvd.nist.gov/vuln/detail/CVE-2026-35640
5e8cb22176e9235e224be0bc530699261eb60e53 https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
GHSA-3h52-cx59-c456 https://github.com/advisories/GHSA-3h52-cx59-c456
GHSA-3h52-cx59-c456 https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
No exploits are available.
Vector: 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 Found at https://github.com/openclaw/openclaw
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-10T12:25:51Z/ Found at https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-10T12:25:51Z/ Found at https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
Vector: 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 Found at https://nvd.nist.gov/vuln/detail/CVE-2026-35640
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-10T12:25:51Z/ Found at https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
Exploit Prediction Scoring System (EPSS)
Percentile 0.31523
EPSS Score 0.00127
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:45:03.901228+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/35xxx/CVE-2026-35640.json 38.6.0