CVE-2026-42420 — MEDIUM (4.3)

Q: How severe is CVE-2026-42420?

CVE-2026-42420 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-42420?

Check the references section above for vendor advisories and patch information. Affected products include: Openclaw Openclaw.

Vulnerability 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 Score

4.3

MEDIUM

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 Products

Vendor	Product	Versions
Openclaw	Openclaw	< 2026.4.8

Related Weaknesses (CWE)

CWE-770

References

https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e8143Patch
https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2rVendor Advisory
https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-valiThird Party Advisory

FAQ

What is CVE-2026-42420?

CVE-2026-42420 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 ...

How severe is CVE-2026-42420?

CVE-2026-42420 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42420?

Check the references section above for vendor advisories and patch information. Affected products include: Openclaw Openclaw.