CVE-2026-42420

OpenClaw before 2026.4.8 contains improper input validation in base64 decode paths that allocate memory before enforcing decoded-size limits. Attackers can exploit multiple code paths to cause memory exhaustion or denial of service through crafted base64-encoded input.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5	Patch
https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r	Vendor Advisory
https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*

History

30 Apr 2026, 14:04

Type	Values Removed	Values Added
References	~~() https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5 -~~	() https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5 - Patch
References	~~() https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r -~~	() https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r - Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation -~~	() https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation - Third Party Advisory
First Time		Openclaw openclaw Openclaw
CPE		cpe:2.3:a:openclaw:openclaw::::::node.js::*

28 Apr 2026, 19:37

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-28 19:37

Updated : 2026-04-30 14:04

NVD link : CVE-2026-42420

Mitre link : CVE-2026-42420

CVE.ORG link : CVE-2026-42420

JSON object : View

Products Affected

openclaw

openclaw

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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