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CVE-2026-28478— OpenClaw < 2026.2.13 - Denial of Service via Unbounded Webhook Request Body Buffering

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 2026.2.13之前版本存在安全漏洞，该漏洞源于Webhook处理程序缓冲请求主体时没有严格的字节或时间限制，可能导致远程未经验证的攻击者发送过大的JSON有效载荷或慢速上传，造成内存压力和可用性下降。

CVSS 7.5 · High EPSS 0.82% · P56

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-28478

Vulnerability Information
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Vulnerability Title
OpenClaw < 2026.2.13 - Denial of Service via Unbounded Webhook Request Body Buffering
Source: CVE Program / CVE List V5
Vulnerability Description
OpenClaw versions prior to 2026.2.13 contain a denial of service vulnerability in webhook handlers that buffer request bodies without strict byte or time limits. Remote unauthenticated attackers can send oversized JSON payloads or slow uploads to webhook endpoints causing memory pressure and availability degradation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 2026.2.13之前版本存在安全漏洞，该漏洞源于Webhook处理程序缓冲请求主体时没有严格的字节或时间限制，可能导致远程未经验证的攻击者发送过大的JSON有效载荷或慢速上传，造成内存压力和可用性下降。
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 ~ 2026.2.13 -

II. Public POCs for CVE-2026-28478

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III. Intelligence Information for CVE-2026-28478

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Patches & Fixes for CVE-2026-28478 (1)

Vendor Advisories for CVE-2026-28478 (2)

Same Patch Batch · OpenClaw · 2026-03-05 · 46 CVEs total

CVE-2026-28466 9.9 CRITICAL OpenClaw < 2026.2.14 - Remote Code Execution via Node Invoke Approval Bypass
CVE-2026-28470 9.8 CRITICAL OpenClaw < 2026.2.2 - Exec Allowlist Bypass via Command Substitution in Double Quotes
CVE-2026-28474 9.8 CRITICAL OpenClaw Nextcloud Talk < 2026.2.6 - Allowlist Bypass via actor.name Display Name Spoofing
CVE-2026-28391 9.8 CRITICAL OpenClaw < 2026.2.2 - Command Injection via cmd.exe Parsing Bypass in Allowlist Enforcemen
CVE-2026-28446 9.4 CRITICAL OpenClaw < 2026.2.1 - Inbound Allowlist Policy Bypass in voice-call Extension via Empty Ca
CVE-2026-29610 8.8 HIGH OpenClaw < 2026.2.14 - Command Hijacking via Unsafe PATH Handling
CVE-2026-28485 8.4 HIGH OpenClaw 2026.1.5 < 2026.2.12 - Missing Authentication in Browser Control HTTP Endpoints
CVE-2026-28463 8.4 HIGH OpenClaw < 2026.2.14 - Arbitrary File Read via Shell Expansion in Safe Bins Allowlist
CVE-2026-28451 8.3 HIGH OpenClaw < 2026.2.14 - SSRF via Feishu Extension Media Fetching
CVE-2026-28476 8.3 HIGH OpenClaw < 2026.2.14 - Server-Side Request Forgery in Tlon Extension Authentication
CVE-2026-28447 8.1 HIGH OpenClaw 2026.1.29-beta.1 < 2026.2.1 - Path Traversal in Plugin Installation via Package N
CVE-2026-28473 8.1 HIGH OpenClaw < 2026.2.2 - Authorization Bypass via /approve Chat Command
CVE-2026-28472 8.1 HIGH OpenClaw < 2026.2.2 - Device Identity Check Bypass in Gateway WebSocket Connect Handshake
CVE-2026-28458 8.1 HIGH OpenClaw 2026.1.20 < 2026.2.1 - Missing Authentication in Browser Relay /cdp WebSocket End
CVE-2026-28468 7.7 HIGH OpenClaw 2026.1.29-beta.1 < 2026.2.14 - Authentication Bypass in Sandbox Browser Bridge Se
CVE-2026-28393 7.7 HIGH OpenClaw 2.0.0-beta3 < 2026.2.14 - Arbitrary JavaScript Module Loading via Hook Transform
CVE-2026-28392 7.5 HIGH OpenClaw < 2026.2.14 - Privilege Escalation in Slack Slash Command Handler via Direct Mess
CVE-2026-28479 7.5 HIGH OpenClaw < 2026.2.15 - Cache Poisoning via Deprecated SHA-1 Hash in Sandbox Configuration
CVE-2026-29609 7.5 HIGH OpenClaw < 2026.2.14 - Denial of Service via Unbounded URL-backed Media Fetch
CVE-2026-28469 7.5 HIGH OpenClaw < 2026.2.14 - Cross-Account Policy Context Misrouting via Shared Webhook Path Amb

Showing top 20 of 46 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-28478

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