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CVE-2026-57026 is an improper validation of syntactic correctness of input vulnerability in the SIP plugin of Juniper Networks Junos OS. On affected MX Series platforms with SPC3 and SRX Series platforms, SIP ALG processing of a specifically malformed SIP INVITE packet can cause the flow processing daemon (flowd) to crash and restart. The issue affects releases before 23.2R2-S7; 23.4 releases before 23.4R2-S8; 24.2 releases before 24.2R2-S5; 24.4 releases before 24.4R2-S4; 25.2 releases before 25.2R2; and 25.4 releases before 25.4R1-S2.
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A network-reachable improper input syntactic-correctness validation vulnerability in Junos OS and Junos OS Evolved that can enable denial of service.
A denial-of-service vulnerability in the SIP plugin of Juniper Networks Junos OS that allows an unauthenticated network attacker to crash and restart flowd via a malformed SIP INVITE packet when SIP ALG is enabled, causing service outage until recovery.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
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