PT-2026-35799 · Openclaw · Openclaw

Keensecuritylab · Published 2026-04-28 · Updated 2026-04-28 · CVE-2026-42420

NVD

CVSS v3.1

4.3

Medium

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

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.

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-42420

Affected Products

Openclaw

References · 5

• https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r · Vendor Advisory
• https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-42420 · Security Note
• https://twitter.com/CVEnew/status/2049227503798047147 · Twitter Post
• https://vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation · Note