CVE-2026-42420

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.

CVSS Vector

References

• https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5
• https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r
• https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation