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

March 6, 2026 (updated March 9, 2026)

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.

References

github.com/Tencent/WeKnora
github.com/Tencent/WeKnora/security/advisories/GHSA-h6gw-8f77-mmmp
github.com/advisories/GHSA-h6gw-8f77-mmmp
nvd.nist.gov/vuln/detail/CVE-2026-30858

Code Behaviors & Features

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