Is CVE-2026-57220 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-57220?

CVE-2026-57220 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-57220

Description

RabbitMQ is a messaging and streaming broker. Prior to 4.2.6, the RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation, allowing an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. This issue is fixed in version 4.2.6.