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CVE-2026-42420— OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation

Quick assessment

Affected
OpenClaw OpenClaw
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenClaw是OpenClaw开源的一个智能人工助理。 OpenClaw 2026.4.8之前版本存在安全漏洞，该漏洞源于base64解码路径中的输入验证不当，在强制解码大小限制之前分配内存，可能导致攻击者通过特制的base64编码输入造成内存耗尽或拒绝服务。

CVSS 4.3 · Medium EPSS 0.30% · P22

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenClaw OpenClaw < 2026.4.8 affected
2026.4.8 unaffected
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I. Basic Information for CVE-2026-42420

Vulnerability Information
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Vulnerability Title
OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenClaw 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenClaw是OpenClaw开源的一个智能人工助理。 OpenClaw 2026.4.8之前版本存在安全漏洞，该漏洞源于base64解码路径中的输入验证不当，在强制解码大小限制之前分配内存，可能导致攻击者通过特制的base64编码输入造成内存耗尽或拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenClaw OpenClaw 0 ~ 2026.4.8 -

II. Public POCs for CVE-2026-42420

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III. Intelligence Information for CVE-2026-42420

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Patches & Fixes for CVE-2026-42420 (1)

Vendor Advisories for CVE-2026-42420 (2)

Same Patch Batch · OpenClaw · 2026-04-28 · 53 CVEs total

CVE-2026-41386 9.1 CRITICAL OpenClaw < 2026.3.22 - Privilege Escalation via Unbound Bootstrap Setup Codes
CVE-2026-42422 8.8 HIGH OpenClaw < 2026.4.8 - Role Bypass in device.token.rotate Function
CVE-2026-41404 8.8 HIGH OpenClaw < 2026.3.31 - Operator Admin Privilege Escalation via Trusted-Proxy Authenticatio
CVE-2026-41378 8.8 HIGH OpenClaw < 2026.3.31 - Privilege Escalation to Remote Code Execution via Unrestricted node
CVE-2026-42426 8.8 HIGH OpenClaw < 2026.4.8 - Improper Authorization in node.pair.approve via operator.write Scope
CVE-2026-41914 8.5 HIGH OpenClaw < 2026.4.8 - Server-Side Request Forgery in QQ Bot Media Fetch Paths
CVE-2026-41394 8.2 HIGH OpenClaw < 2026.3.31 - Unauthorized Operator Scope Access in Unauthenticated Plugin-Auth R
CVE-2026-41383 8.1 HIGH OpenClaw < 2026.4.2 - Arbitrary Remote Directory Deletion via Mis-scoped Mirror Mode Paths
CVE-2026-42431 8.1 HIGH OpenClaw < 2026.4.8 - Persistent Profile Mutation via node.invoke(browser.proxy) Bypass
CVE-2026-41384 7.8 HIGH OpenClaw < 2026.3.24 - Environment Variable Injection via Workspace Config in CLI Backend
CVE-2026-41396 7.8 HIGH OpenClaw < 2026.3.31 - Environment Variable Override of Plugin Trust Root
CVE-2026-41387 7.8 HIGH OpenClaw < 2026.3.22 - Supply Chain Redirection via Incomplete Host Environment Sanitizati
CVE-2026-42432 7.8 HIGH OpenClaw < 2026.4.8 - Command Escalation via Node Pairing Reconnect Bypass
CVE-2026-41912 7.6 HIGH OpenClaw < 2026.4.8 - Server-Side Request Forgery Policy Bypass via Interaction-Triggered
CVE-2026-41399 7.5 HIGH OpenClaw < 2026.3.28 - Denial of Service via Unbounded Pre-auth WebSocket Upgrades
CVE-2026-41405 7.5 HIGH OpenClaw < 2026.3.31 - Resource Exhaustion via Unauthenticated MS Teams Webhook Body Parsi
CVE-2026-41395 7.5 HIGH OpenClaw < 2026.3.28 - Webhook Replay via Query Parameter Reordering in Plivo V3
CVE-2026-42423 7.5 HIGH OpenClaw < 2026.4.8 - strictInlineEval Approval Boundary Bypass via Approval-Timeout Fallb
CVE-2026-41380 7.3 HIGH OpenClaw < 2026.3.28 - Arbitrary Execution Allowlist via Wrapper Carrier Executables
CVE-2026-41390 7.3 HIGH OpenClaw < 2026.3.28 - Exec Allowlist Bypass via Unregistered /usr/bin/script Wrapper

Showing top 20 of 53 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: OpenClaw
Same vendor: OpenClaw
Same weakness: CWE-770

V. Comments for CVE-2026-42420

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