CVE-2026-66080
RabbitMQ: Super-stream partitions unbounded 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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
RabbitMQ: Super-stream partitions unbounded 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.
- Record
CVE-2026-66080- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-770
- Updated
- 2026-11-02
EUVDEUVD-2026-85637
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.
- Record
EUVD-2026-85637- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-66080- CVSS 4.0
- 5.9 Medium
CVSS: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 - CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
OSV
RabbitMQ: Super-stream partitions unbounded 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.
- Record
CVE-2026-66080- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-770
- Updated
- 2026-11-02
OSVDEBIAN-CVE-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 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.
- Record
DEBIAN-CVE-2026-66080- CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVRHSA-2026:67552
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- Record
RHSA-2026:67552- CVSS 3.1
- 8.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-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 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.
- Record
UBUNTU-CVE-2026-66080- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 4.9 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVBIT-rabbitmq-2026-66080 No score
RabbitMQ: Super-stream partitions unbounded 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.
- Record
BIT-rabbitmq-2026-66080- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
rabbitmqBitnami |
4.1.0 up to 4.1.11, 4.2.0 up to 4.2.6 | 4.1.114.2.6 |
rabbitmq-serverDebian:13 |
All versions, plus listed versions 4.0.5-104.0.5-114.0.5-124.0.5-134.0.5-14 Show 14 moreShow less4.0.5-64.0.5-6+deb13u14.0.5-6+deb13u24.0.5-84.0.5-94.3.0-14.3.0-24.3.0-34.3.2-14.3.2-24.3.2-34.3.2-44.3.2-54.3.6-1 |
None known |
rabbitmq-serverDebian:14 |
before 4.3.0-2, plus listed versions 4.0.5-104.0.5-114.0.5-124.0.5-134.0.5-14 Show 4 moreShow less4.0.5-64.0.5-84.0.5-94.3.0-1 |
4.3.0-2 |
rabbitmq-server4.3Red Hat:hummingbird:1 From an advisory covering 54 CVEs |
before 0:4.3.6-1.hum1 | 0:4.3.6-1.hum1 |
rabbitmq-serverUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 3.5.4-13.5.4-33.5.4-3.13.5.7-13.5.7-1ubuntu0.16.04.1 Show 5 moreShow less3.5.7-1ubuntu0.16.04.23.5.7-1ubuntu0.16.04.43.5.7-1ubuntu0.16.04.4+esm13.5.7-1ubuntu0.16.04.4+esm23.5.7-1ubuntu0.16.04.4+esm3 |
None known |
rabbitmq-serverUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 3.6.10-13.6.10-1ubuntu0.13.6.10-1ubuntu0.33.6.10-1ubuntu0.43.6.10-1ubuntu0.53.6.10-1ubuntu0.5+esm1 |
None known |
rabbitmq-serverUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 3.7.8-4ubuntu23.7.18-13.8.2-0ubuntu13.8.2-0ubuntu1.13.8.2-0ubuntu1.2 Show 8 moreShow less3.8.2-0ubuntu1.33.8.2-0ubuntu1.43.8.2-0ubuntu1.53.8.3-0ubuntu0.13.8.3-0ubuntu0.23.8.3-0ubuntu0.33.8.3-0ubuntu0.3+esm13.8.3-0ubuntu0.3+esm2 |
None known |
rabbitmq-serverUbuntu:22.04:LTS |
All versions, plus listed versions 3.8.9-3ubuntu13.9.8-13.9.8-23.9.8-33.9.8-5 Show 8 moreShow less3.9.8-63.9.13-13.9.13-1ubuntu0.22.04.13.9.13-1ubuntu0.22.04.23.9.27-0ubuntu0.13.9.27-0ubuntu0.23.9.27-0ubuntu0.53.9.27-0ubuntu0.6 |
None known |
rabbitmq-serverUbuntu:24.04:LTS |
All versions, plus listed versions 3.12.1-13.12.1-1ubuntu13.12.1-1ubuntu1.23.12.1-1ubuntu1.43.12.1-1ubuntu1.63.12.1-1ubuntu1.7 |
None known |
rabbitmq-serverUbuntu:26.04:LTS |
All versions, plus listed versions 4.0.5-8ubuntu24.0.5-10ubuntu14.0.5-10ubuntu24.0.5-10ubuntu34.0.5-10ubuntu44.0.5-10ubuntu54.0.5-10ubuntu5.14.0.5-10ubuntu5.2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-66080 is a medium vulnerability (CVSS 5.9) in Broadcom Rabbitmq Server, published September 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. Fixed in rabbitmq 4.1.11.
References
github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-wg79-5449-m728
nvd.nist.gov/vuln/detail/CVE-2026-66080
security-tracker.debian.org/tracker/CVE-2026-66080
Show 194 moreShow less
access.redhat.com/errata/RHSA-2026:67552
images.redhat.com
security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_67552.json
bugzilla.redhat.com/show_bug.cgi?id=2482215
cve.org/CVERecord?id=CVE-2026-44839
ubuntu.com/security/CVE-2026-66080
Left out here: 124 references. The JSON record has them.