CVE-2026-118376: WeKnora before 0.8.2 SSRF Guard Bypass via NAT64 IPv6 Addresses

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-28 · updated 2026-10-28
Weakness: CWE-918

Description

WeKnora before 0.8.2 contains a server-side request forgery vulnerability in isRestrictedIP() that misclassifies NAT64-prefixed IPv6 addresses as public. Authenticated attackers can supply URLs resolving to NAT64 encodings of internal addresses via web_fetch or URL-based knowledge import to reach internal services or cloud metadata endpoints.

Affected products

Tencent WeKnora: from 0.2.11 before 0.8.2 — fixed in 0.8.2

How to fix

Upgrade to a fixed version: Tencent WeKnora 0.8.2. Check the vendor advisory for mitigations.

References

https://github.com/Tencent/WeKnora
https://github.com/Tencent/WeKnora/blob/3d5d8bfcdfeeea266b292b71cea616847af28d0f/internal/utils/security.go#L267-L327
https://github.com/Tencent/WeKnora/commit/d7ccd5ba517cc3968e6d5000a2ab0f4b51ef1dda
https://github.com/Tencent/WeKnora/commit/ff818b681f10bc29edbc48fe35f00009dc276bfa
https://github.com/Tencent/WeKnora/issues/4092
https://github.com/Tencent/WeKnora/releases/tag/v0.8.2
https://www.vulncheck.com/advisories/weknora-before-0.8.2-ssrf-guard-bypass-via-nat64-ipv6-addresses

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