CVE-2026-35665

Q: How do I fix CVE-2026-35665?

Upgrade openclaw to 2026.3.24 or later.

Q: Is CVE-2026-35665 being actively exploited?

Not that we know of. CVE-2026-35665 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.33% is the estimated probability that it will be exploited in the next 30 days. That is higher than 25% of all scored CVEs.

Q: How severe is CVE-2026-35665?

CVE-2026-35665 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-35665 affect?

Published advisories record a fix for openclaw (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

5.3

CVSS v3

NVD

Description

OpenClaw before 2026.3.24 contains an incomplete fix for CVE-2026-32011 where the Feishu webhook handler accepts request bodies with permissive limits of 1MB and 30-second timeout before signature verification. An unauthenticated attacker can exhaust server connection resources by sending concurrent slow HTTP POST requests to the Feishu webhook endpoint, blocking legitimate webhook deliveries.

CWE-405

How to fix

Remediation Available

openclawNVD

Affected:< 2026.3.24Fixed in:2026.3.24CVE-2026-35665derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory1

vulncheck.com

Related Vulnerabilities

Other CWE-405 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-11479	High	7.5	92%	-	Fix
CVE-2024-11187	High	7.5	15%	-	Fix
CVE-2025-8677	High	7.5	11%	-	Fix
CVE-2021-38447	High	8.6	2.1%	-	Fix
CVE-2021-21359	Medium	5.9	1.7%	-	Fix
CVE-2018-15492	High	7.5	1.1%	-	-

Common questions

How do I fix CVE-2026-35665?

Upgrade openclaw to 2026.3.24 or later.

Is CVE-2026-35665 being actively exploited?

Not that we know of. CVE-2026-35665 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.33% is the estimated probability that it will be exploited in the next 30 days. That is higher than 25% of all scored CVEs.

How severe is CVE-2026-35665?

CVE-2026-35665 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-35665 affect?

Published advisories record a fix for openclaw (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-35665

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.