CVE-2026-30858

MediumPublic PoC

Published: 07 March 2026

Published

07 March 2026

Modified

09 March 2026

KEV Added

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Patch

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CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Score 0.0012 30.8th percentile

Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-30858 is a medium-severity SSRF (CWE-918) vulnerability in Tencent Weknora. Its CVSS base score is 6.5 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 30.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

This vulnerability is AI-related — categorised as NLP and Transformers; in the Supply Chain and Deployment risk domain.

The strongest mitigations our analysis identified are NIST 800-53 SC-7 (Boundary Protection) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2026-30858 is a DNS rebinding vulnerability in the web_fetch tool of WeKnora, an LLM-powered framework designed for deep document understanding and semantic retrieval. Versions of WeKnora prior to 0.3.0 are affected. The flaw enables bypassing URL validation, allowing access to internal resources on the server, including private IP addresses such as 127.0.0.1 and 192.168.x.x.

An unauthenticated attacker can exploit this vulnerability by crafting a malicious domain that resolves to a public IP address during the validation phase but subsequently resolves to a private IP during execution. This grants access to sensitive local services and enables potential data exfiltration. The vulnerability carries a CVSS v3.1 base score of 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) and is associated with CWE-918 (Server-Side Request Forgery).

The vulnerability has been patched in WeKnora version 0.3.0. Additional details on the advisory and mitigation are available in the GitHub security advisory at https://github.com/Tencent/WeKnora/security/advisories/GHSA-h6gw-8f77-mmmp.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-10181

Vulnerability details

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.

CWE(s): CWE-918

AI Security AnalysisAI

AI Category: NLP and Transformers
Risk Domain: Supply Chain and Deployment
OWASP Top 10 for LLMs 2025: None mapped
Classification Reason: Matched keywords: llm

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1005 Data from Local System Collection

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.

attack.mitre.org →

Why these techniques?

SSRF via DNS rebinding in public web_fetch tool directly enables T1190 to reach internal endpoints; resulting access to local services/private IPs enables T1005 data collection.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1