CVE-2026-42420 MEDIUM

CVE-2026-42420: OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation

Vendor Openclaw
Product OpenClaw
Weakness CWE-770 · Uncontrolled resource consumption
Published April 28, 2026
Last update April 29, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 28, 2026 CVE published
April 29, 2026 Record updated