CVE-2026-30858 WeKnora: DNS Rebinding Vulnerability in web_fetch Tool Allows SSRF to Internal Resources
An unauthenticated attacker can exploit DNS rebinding in the web_fetch tool to access internal network resources and exfiltrate sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-30858?
CVE-2026-30858 is a medium-severity server-side request forgery vulnerability in Tencent WeKnora, published on 7 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-30858?
3 open source packages ship an affected version, including github.com/Tencent/WeKnora. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/Tencent/WeKnora Go | All versions | None |
github.com/Tencent/WeKnora Go | All versions | 0.3.0 |
github.com/Tencent/WeKnora Go | All versions | 0.3.0 |
Products include Tencent Weknora.
How do I fix CVE-2026-30858?
Upgrade github.com/Tencent/WeKnora to 0.3.0 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-30858 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30858 exists.
Other vulnerabilities in Tencent WeKnora
- CVE-2026-30860 WeKnora: Remote Code Execution via SQL Injection Bypass in AI Database Query Tool
- CVE-2026-30861 WeKnora: Remote Code Execution (RCE) via Command Injection in MCP Stdio Configuration Validation
- CVE-2026-22688 WeKnora has Command Injection in MCP stdio test
- CVE-2026-30855 WeKnora: Broken Access Control in Tenant Management
- CVE-2025-11046 Tencent WeKnora test testEmbeddingModel server-side request forgery
Sources
Also known as GHSA-h6gw-8f77-mmmp, GO-2026-4643.