# CVE-2026-42420

> Vulnerability · severity: **MEDIUM** (CVSS 4.3).

## 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.

## Key facts

- **CVE ID:** CVE-2026-42420
- **Published:** 2026-04-28
- **CVSS severity:** MEDIUM
- **CVSS base score:** 4.3
- **CWE codes:** CWE-770

## Affected products

- `openclaw:openclaw`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42420

## Citation

> AI Analytics. CVE-2026-42420. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-42420. Derived from NIST NVD. Licensed CC0.

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