What’s Vulnerable › Vulnerabilities

CVE-2026-77408: RabbitMQ amqp091-go: Silent Data Truncation and State Corruption via Shortstr Integer Overflow

• Severity: critical (CVSS 9.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-09-23
• Weakness: CWE-190

Description

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, the writeShortstr function in write.go casts the byte length of AMQP shortstr property values to uint8 without first rejecting values longer than 255 bytes. An application that accepts an oversized CorrelationId, ReplyTo, MessageId, Expiration, UserId, AppId, ContentType, ContentEncoding, or Type value can therefore serialize a wrapped length and only a truncated prefix, while reporting no error. The resulting silent metadata corruption can break request and reply correlation, routing, tracing, and downstream message processing. This issue is fixed in version 1.13.0.

Affected products

• rabbitmq amqp091-go: before 1.13.0

References

• https://github.com/rabbitmq/amqp091-go/commit/6959423aa2784a1971e399175dfb2065dea0f3b0
• https://github.com/rabbitmq/amqp091-go/pull/354
• https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0
• https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-j497-x9hr-x34x

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