{"schema":"threatline.record/2","record":{"id":"CVE-2026-91768","aliases":["GHSA-62xp-839h-2637"],"summary":"IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)","details":"The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. 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