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BREW-openclaw-cli-CVE-2026-42420 — OpenClaw: Multiple Code Paths Missing Base64 Pre-Allocation Size Checks

Affected: Homebrew: openclaw-cli

## Impact

Multiple Code Paths Missing Base64 Pre-Allocation Size Checks.

Several base64 decode paths could allocate before enforcing decoded-size limits.

OpenClaw is a user-controlled local assistant. This advisory is scoped to the OpenClaw trust model and does not assume a multi-tenant service boundary.

## Affected Packages / Versions

- Package: `openclaw` (npm) - Affected versions: `<=v2026.4.2` - Patched versions: `2026.4.8`

## Fix

The issue was fixed on `main` and is available in the patched npm version listed above. The verified fixed tree is commit `d7c3210cd6f5fdfdc1beff4c9541673e814354d5`.

## Verification

The fix was re-checked against `main` before publication, including targeted regression tests for the affected security boundary.

## Credits

Thanks @zsxsoft and @KeenSecurityLab for reporting.

EUVD-2026-307908

fkie_cve-2026-42420

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.

GHSA-ccx3-fw7q-rr2r — OpenClaw: Multiple Code Paths Missing Base64 Pre-Allocation Size Checks

Affected: npm: openclaw