Vulnerability · Published Sep 16, 2026 · Assigned by GitHub_M
CVE-2026-77403RabbitMQ amqp091-go: Denial of Service via Sub-Spec Frame Size Negotiation
High 8.9
In plain English
A high-severity resource allocation without limits in amqp091-go from rabbitmq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Connection.openTune in connection.go accepts a server-advertised FrameMax below the AMQP frameMinSize value of 4096 bytes because the connection negotiation loop does not enforce the protocol minimum. A malicious or compromised AMQP broker can therefore advertise an extremely small FrameMax, causing later client publications to be fragmented into excessive numbers of frames and write operations. This can consume CPU and stall the client or its host. This issue is fixed in version 1.13.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-rabbitmq-amqp091-go | no fix listed | DEBIAN-CVE-2026-77403 |
| Debian:13 | golang-github-rabbitmq-amqp091-go | no fix listed | DEBIAN-CVE-2026-77403 |
| Debian:14 | golang-github-rabbitmq-amqp091-go | 1.14.0-1 | DEBIAN-CVE-2026-77403 |
| Go | github.com/rabbitmq/amqp091-go | 1.13.0 | GO-2026-6503 |
| Go | github.com/rabbitmq/amqp091-go | 1.13.0 | GHSA-xwwf-m8fg-p9q2 |
| Ubuntu:24.04:LTS | golang-github-rabbitmq-amqp091-go | no fix listed | UBUNTU-CVE-2026-77403 |
| Ubuntu:26.04:LTS | golang-github-rabbitmq-amqp091-go | no fix listed | UBUNTU-CVE-2026-77403 |
| Ubuntu:26.10 | golang-github-rabbitmq-amqp091-go | no fix listed | UBUNTU-CVE-2026-77403 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| rabbitmq | amqp091-go | < 1.13.0 |
Weakness: CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
References
- https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-xwwf-m8fg-p9q2 x_refsource_CONFIRM
- https://github.com/rabbitmq/amqp091-go/pull/353 x_refsource_MISC
- https://github.com/rabbitmq/amqp091-go/commit/2e0a919b89f337dbf58db2bb34ab206dac354a06 x_refsource_MISC
- https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0 x_refsource_MISC