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Phoenix (>= 1.8.0-Rc.0, < 1.8.9)

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Phoenix Transport Channel Exhaustion Denial of Service

The Phoenix web framework lacks limits on channels per transport, allowing an unauthenticated attacker to cause a DoS by exhausting Erlang VM process limits via CVE-2026-56811.

Phoenix +3 denial-of-service web-framework cve-2026-56811
1c