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CVE-2026-53859— OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency

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团队开源的一个智能人工助理。 OpenClaw 2026.5.26之前版本存在处理逻辑错误漏洞，该漏洞源于主机名验证问题，导致攻击者可以在模型或工作空间派生URL中使用尾点标记来绕过拦截列表比较，并利用不一致的主机名检查访问本应被阻止的目的地。

CVSS 6.5 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenClaw OpenClaw < 2026.5.26 affected
2026.5.26 unaffected
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I. Basic Information for CVE-2026-53859

Vulnerability Information
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Vulnerability Title
OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency
Source: CVE Program / CVE List V5
Vulnerability Description
OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缺失要素致使对比不完全
Source: CVE Program / CVE List V5
Vulnerability Title
OpenClaw 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenClaw是OpenClaw团队开源的一个智能人工助理。 OpenClaw 2026.5.26之前版本存在处理逻辑错误漏洞，该漏洞源于主机名验证问题，导致攻击者可以在模型或工作空间派生URL中使用尾点标记来绕过拦截列表比较，并利用不一致的主机名检查访问本应被阻止的目的地。
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 ~ 2026.5.26 -

II. Public POCs for CVE-2026-53859

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III. Intelligence Information for CVE-2026-53859

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Vendor Advisories for CVE-2026-53859 (2)

Same Patch Batch · OpenClaw · 2026-06-16 · 27 CVEs total

CVE-2026-53843 8.8 HIGH OpenClaw < 2026.5.26 - Node Token Revocation Bypass via Pairing-Scoped Device Session
CVE-2026-53853 8.3 HIGH OpenClaw < 2026.5.12 - Argument Pattern Bypass in Exec Allowlist via Linux and macOS
CVE-2026-53866 8.1 HIGH OpenClaw < 2026.5.12 - Allowlist Bypass in Shell Inline-Command Parsing
CVE-2026-53864 8.1 HIGH OpenClaw < 2026.5.26 - Insufficient Environment Variable Sanitization in Node.js Control V
CVE-2026-53849 8.1 HIGH OpenClaw < 2026.5.7 - Privilege Escalation via Mutable Discord Display Names in allowFrom
CVE-2026-53857 8.1 HIGH OpenClaw < 2026.5.3 - Mutable Display Name Binding in Zalo allowFrom Policy
CVE-2026-53855 8.1 HIGH OpenClaw < 2026.4.2 - Shell Positional Parameters Bypass in Inline-Eval Checks
CVE-2026-53840 7.1 HIGH OpenClaw < 2026.5.12 - Custom Header Leakage via MCP Streamable HTTP Cross-Origin Redirect
CVE-2026-53842 7.1 HIGH OpenClaw < 2026.5.2 - Arbitrary Python Runtime Execution via CLOUDSDK_PYTHON Environment V
CVE-2026-53846 7.1 HIGH OpenClaw < 2026.4.29 - Arbitrary Package Manager Execution via Workspace .env npm_execpath
CVE-2026-53858 7.1 HIGH OpenClaw < 2026.5.2 - Arbitrary Runtime Dependency Loading via STATE_DIRECTORY Environment
CVE-2026-53863 7.1 HIGH OpenClaw < 2026.4.25 - Unvalidated Group ID Acceptance in Tool Group Policy
CVE-2026-53865 7.1 HIGH OpenClaw < 2026.5.2 - Arbitrary Command Execution via Workspace-Derived Service PATH
CVE-2026-53861 6.6 MEDIUM OpenClaw < 2026.5.6 - Allowlist Bypass via Combined POSIX Inline Flags on macOS
CVE-2026-53854 6.5 MEDIUM OpenClaw < 2026.4.25 - Privilege Escalation via ownerAllowFrom Wildcard Inheritance in Int
CVE-2026-53844 6.5 MEDIUM OpenClaw < 2026.4.29 - Session Visibility Check Bypass in Shared Memory Search
CVE-2026-53841 6.1 MEDIUM OpenClaw < 2026.5.12 - Cross-Site Scripting via Unsafe Markdown Links in Exported Session
CVE-2026-53856 5.5 MEDIUM OpenClaw 2026.4.23 < 2026.4.24 - Insecure File Permissions in Config Recovery via OpenClaw
CVE-2026-53850 5.5 MEDIUM OpenClaw < 2026.4.25 - Control Scope Enforcement Bypass in Focus Command
CVE-2026-53852 5.4 MEDIUM OpenClaw < 2026.4.25 - Scope Bypass via Empty-Scope Device Re-pairing

Showing top 20 of 27 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: OpenClaw
Same vendor: OpenClaw
Same weakness: CWE-1023

V. Comments for CVE-2026-53859

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