CVE-2026-42420: Openclaw

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Openclaw Openclaw: before 2026.4.8 (fixed in 2026.4.8)

Published 2026-04-28. Last modified 2026-06-17.