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CVE-2026-52134 is an authentication bypass vulnerability in libiec61850 v1.6. The issue is located in the parseGoosePayload() function in goose_receiver.c and allows an attacker to bypass authentication by supplying a previously captured GOOSE frame. The flaw indicates that the implementation does not adequately prevent replay or reuse of authenticated GOOSE traffic, enabling acceptance of a captured frame as valid.
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