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CVE-2026-42420

OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation

Published: Apr 28, 2026Updated: Apr 28, 2026 Sources: CVE List NVD
NVD MITRE
4.3CVSS
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 exhaustion or denial of service through crafted base64-encoded input.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low

Weaknesses

CWE-770

Affected Products

OpenClaw
OpenClaw

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

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

Timeline

Published
Apr 28, 2026
Last Updated
Apr 28, 2026

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