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CVE-2026-30858— WeKnora: DNS Rebinding Vulnerability in web_fetch Tool Allows SSRF to Internal Resources

Quick assessment

Affected
Tencent WeKnora
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.

Tencent WeKnora是中国腾讯（Tencent）公司的一个基于LLM的框架，具有使用RAG范式进行深度文档理解、语义检索和上下文感知答案等功能。 Tencent WeKnora 0.3.0之前版本存在代码问题漏洞，该漏洞源于web_fetch工具存在DNS重绑定，可能导致访问服务器内部资源。

CVSS 6.5 · Medium EPSS 0.48% · P39
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I. Basic Information for CVE-2026-30858

Vulnerability Information
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Vulnerability Title
WeKnora: DNS Rebinding Vulnerability in web_fetch Tool Allows SSRF to Internal Resources
Source: CVE Program / CVE List V5
Vulnerability Description
WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a DNS rebinding vulnerability in the web_fetch tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data. This issue has been patched in version 0.3.0.
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
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Tencent WeKnora 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tencent WeKnora是中国腾讯（Tencent）公司的一个基于LLM的框架，具有使用RAG范式进行深度文档理解、语义检索和上下文感知答案等功能。 Tencent WeKnora 0.3.0之前版本存在代码问题漏洞，该漏洞源于web_fetch工具存在DNS重绑定，可能导致访问服务器内部资源。
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
Tencent WeKnora < 0.3.0 -

II. Public POCs for CVE-2026-30858

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III. Intelligence Information for CVE-2026-30858

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Vendor Advisories for CVE-2026-30858 (1)

Same Patch Batch · Tencent · 2026-03-07 · 8 CVEs total

CVE-2026-30861 10.0 CRITICAL WeKnora: Remote Code Execution (RCE) via Command Injection in MCP Stdio Configuration Vali
CVE-2026-30860 10.0 CRITICAL WeKnora: Remote Code Execution via SQL Injection Bypass in AI Database Query Tool
CVE-2026-30855 8.8 HIGH WeKnora: Broken Access Control in Tenant Management
CVE-2026-30247 5.9 MEDIUM WeKnora: SSRF via Redirection
CVE-2026-30856 5.9 MEDIUM WeKnora: Tool Execution Hijacking via Ambigous Naming Convention In MCP client and Indirec
CVE-2026-30859 5.3 MEDIUM WeKnora: Broken Access Control - Cross-Tenant Data Exposure
CVE-2026-30857 5.3 MEDIUM WeKnora: Unauthorized Cross‑Tenant Knowledge Base Cloning

IV. Related Vulnerabilities

Same product: WeKnora
Same vendor: Tencent
Same weakness: CWE-918

V. Comments for CVE-2026-30858

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