CVE-2026-42420

MEDIUM 4.3

OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	openclaw
Product	openclaw
Published	Apr 28, 2026

Stay Ahead of the Next One

Get instant alerts for openclaw openclaw

Be the first to know when new medium vulnerabilities affecting openclaw openclaw are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

OpenClaw / OpenClaw

0 < 2026.4.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 zsx (@zsxsoft) KeenSecurityLab