CVE-2026-66080
published 2026-09-23CVE-2026-66080: RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is…
PriorityP426medium4.9CVSS 3.1
AVNACLPRHUINSUCNINAH
EPSS
0.32%
23.3th percentile
RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| broadcom | rabbitmq_server | >= 4.1.0 < 4.1.11 | 4.1.11 |
| broadcom | rabbitmq_server | >= 4.2.0 < 4.2.6 | 4.2.6 |
| rabbitmq | rabbitmq-server | — | — |
| rabbitmq | rabbitmq-server | — | — |
| rabbitmq | rabbitmq-server | — | — |
CVSS provenance
nvdv3.14.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
nvdv4.05.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat5.9MEDIUM
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Red Hat
rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation
vendor_redhat·2026-09-23·CVSS 5.9
CVE-2026-66080 [MEDIUM] CWE-770 rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation
rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation
RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.
A flaw was found in RabbitMQ. A highly privileged remote attacker, with the `rabbitmq_stream_management` plugin enabled and access to the target vhost, can exploit an unbounded allocation vulnerability in the super-stream partitions. This
VulDB
RabbitMQ up to 4.1.10/4.2.5 Stream Management validate_partitions allocation of resources
vuldb·2026-09-23·CVSS 5.9
CVE-2026-66080 [MEDIUM] RabbitMQ up to 4.1.10/4.2.5 Stream Management validate_partitions allocation of resources
A vulnerability, which was classified as problematic, was found in RabbitMQ up to 4.1.10/4.2.5. Affected by this vulnerability is the function validate_partitions of the component Stream Management. Executing a manipulation can lead to allocation of resources.
This vulnerability is tracked as CVE-2026-66080. The attack can be launched remotely. No exploit exists.
You should upgrade the affected component.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-66080 rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation [fedora-all]
bugzilla·2026-09-24·CVSS 5.9
CVE-2026-66080 [MEDIUM] CVE-2026-66080 rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation [fedora-all]
CVE-2026-66080 rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6
Bugzilla
CVE-2026-66080 rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation
bugzilla·2026-09-23·CVSS 5.9
CVE-2026-66080 [MEDIUM] CVE-2026-66080 rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation
CVE-2026-66080 rabbitmq-server: RabbitMQ: Denial of Service via unbounded super-stream partition allocation
RabbitMQ is a messaging and streaming broker. Prior to versions 4.1.11, 4.2.6, and 4.3.0, validate_partitions only checks that the requested partition count is at least 1, with no upper bound. A large count such as lists:seq(0, 500000000) allocates roughly 8GB. Preconditions include The rabbitmq_stream_management plugin must be enabled. The caller needs the management tag and access to the target vhost.. This issue is fixed in versions 4.1.11, 4.2.6, and 4.3.0.
2026-09-23
Published