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.
Published: 2026-04-28
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service via memory exhaustion
Action: Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-ccx3-fw7q-rr2r OpenClaw: Multiple Code Paths Missing Base64 Pre-Allocation Size Checks
History

Tue, 28 Apr 2026 19:15:00 +0000

Type Values Removed Values Added
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.
Title OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation
First Time appeared Openclaw
Openclaw openclaw
Weaknesses CWE-770
CPEs cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*
Vendors & Products Openclaw
Openclaw openclaw
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}


Subscriptions

Openclaw Openclaw
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-04-29T15:10:38.714Z

Reserved: 2026-04-27T11:38:59.195Z

Link: CVE-2026-42420

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-04-28T19:37:45.680

Modified: 2026-04-30T14:04:43.353

Link: CVE-2026-42420

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-28T23:00:13Z

Weaknesses