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An unauthenticated, network-based attacker can exploit CVE-2026-57026, an improper input validation vulnerability, in the SIP plugin of Juniper Networks Junos OS. If the SIP ALG is enabled on affected MX Series with SPC3 or SRX Series devices, processing a malformed SIP invite packet will cause the flow processing daemon (flowd) to crash and restart, leading to a complete denial of service until the system recovers.