{"id":"CVE-2026-77406","title":"RabbitMQ amqp091-go is a Go AMQP 0.9.1 client","summary":"RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.Qos in channel.go accepts negative prefetchCount and prefetchSize integers and casts them directly to uint16 and uint32 fields in the basic.qos method because valida…","severity":"high","cvss":8.2,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","cwe":["CWE-195","CWE-190"],"vendor":"rabbitmq","product":"amqp091-go","affected":["amqp091-go < 1.13.0"],"patched":["github.com/rabbitmq/amqp091-go 1.13.0"],"published":"2026-09-16","updated":"2026-09-23","sourceUpdated":"2026-09-23T18:19:19.803","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77406","references":[{"url":"https://github.com/rabbitmq/amqp091-go/commit/3b879e1d1d25b544e26b3bc3d7db3213203c0f3b","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/amqp091-go/pull/351","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-rm6m-hrcw-jw33","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77406"},{"url":"https://github.com/advisories/GHSA-rm6m-hrcw-jw33"},{"url":"https://github.com/rabbitmq/amqp091-go"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77406.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-77406"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535493"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77406"},{"url":"https://access.redhat.com/errata/RHSA-2026:68290"},{"url":"https://access.redhat.com/errata/RHSA-2026:79366"},{"url":"https://access.redhat.com/errata/RHSA-2026:79546"},{"url":"https://access.redhat.com/errata/RHSA-2026:77656"}],"tags":["nvd","cve.org","ghsa","go","osv","csaf","vex","red-hat"],"epss":0.00524,"epssPercentile":0.44234,"aliases":["GHSA-rm6m-hrcw-jw33","GO-2026-6502"],"ecosystem":"go","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T18:18:39.588892Z"},"cvssSource":"cna","scores":{"cna":8.2,"vendor":7.5},"ingestedAt":"2026-09-16T14:57:28.049Z","slug":"CVE-2026-77406","body":"## Overview\n\nRabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.Qos in channel.go accepts negative prefetchCount and prefetchSize integers and casts them directly to uint16 and uint32 fields in the basic.qos method because validateQos is absent. Values such as -1 therefore wrap to 65535 or 4294967295 instead of being rejected. An application that permits untrusted configuration of these Qos values can unintentionally request extremely large prefetch limits, allowing a broker to deliver enough queued messages to exhaust client memory and disrupt processing. This issue is fixed in version 1.13.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-77406)\n\nAffected packages:\n\n- `github.com/rabbitmq/amqp091-go < 1.13.0`\n\nPatched in:\n\n- `github.com/rabbitmq/amqp091-go 1.13.0`\n\nSource: https://github.com/advisories/GHSA-rm6m-hrcw-jw33\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Multicluster Global Hub, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat OpenStack Platform 18.0, Red Hat Quay 3 · no fix planned: Multicluster Global Hub, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat OpenStack Platform 18.0, Red Hat Quay 3 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77406.json)\n- **RHSA-2026:68290** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68290)\n- **RHSA-2026:79366** · Red Hat · fixed in: Red Hat Quay 3.10 · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79366)\n- **RHSA-2026:79546** · Red Hat · fixed in: Red Hat Quay 3.12 · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79546)\n- **RHSA-2026:77656** · Red Hat · fixed in: Red Hat Quay 3.9 · released 2026-10-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:77656)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}