CVE-2026-42420

MEDIUM

OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation

Title source: cna
STIX 2.1

Description

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.

References (3)

Core 3
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-ccx3-fw7q-rr2r)
https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r
Third Party Advisory third-party-advisory
VulnCheck Advisory: OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation
https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation

Scores

CVSS v3 4.3
EPSS 0.0030
EPSS Percentile 21.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (4)
npm/openclaw 0 - 2026.4.8npm
OpenClaw/OpenClaw < 2026.4.8
openclaw/openclaw < 2026.4.8
OpenClaw/OpenClaw 2026.4.8
Published Apr 28, 2026
Tracked Since Apr 29, 2026