CVE-2026-66074
published 2026-09-23CVE-2026-66074: RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, match_value/3 passes the user-supplied ?name=…
PriorityP340medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.38%
31.3th percentile
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, match_value/3 passes the user-supplied ?name= regular expression to re:run with no match_limit option, and executes it once per resource in the result set. OTP's default 10M match_limit caps each call at roughly 100-200ms, but the regex runs once per resource in the result set. With a large set, for example 5000 queues at 150ms each, a single request consumes 12 or more minutes of CPU. Parallel requests saturate the schedulers. The use_regex=true option is a supported feature on list endpoints, so this path is reachable through normal API use. Preconditions include Any user with the management tag can exploit this.. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| broadcom | rabbitmq_server | >= 3.13.0 < 3.13.15 | 3.13.15 |
| broadcom | rabbitmq_server | >= 4.0.0 < 4.0.20 | 4.0.20 |
| 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 | — | — |
| rabbitmq | rabbitmq-server | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv4.06.0MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:L/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_redhat6.0MEDIUM
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VulDB
VMware RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5 Regex Execution match_value Name incorrect bitwise shift of integer
vuldb·2026-09-23·CVSS 6.0
CVE-2026-66074 [MEDIUM] VMware RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5 Regex Execution match_value Name incorrect bitwise shift of integer
A vulnerability classified as problematic was found in VMware RabbitMQ up to 3.13.14/4.0.19/4.1.10/4.2.5. Affected by this issue is the function match_value of the component Regex Execution. Executing a manipulation of the argument Name can lead to incorrect bitwise shift of integer.
The identification of this vulnerability is CVE-2026-66074. The attack may be launched remotely. There is no exploit available.
Upgrading the affected component is advised.
Red Hat
rabbitmq: RabbitMQ: Denial of Service via management API regular expression filter
vendor_redhat·2026-09-23·CVSS 6.0
CVE-2026-66074 [MEDIUM] CWE-1333 rabbitmq: RabbitMQ: Denial of Service via management API regular expression filter
rabbitmq: RabbitMQ: Denial of Service via management API regular expression filter
A flaw was found in RabbitMQ. A remote attacker with management privileges could exploit a regular expression (regex) filter in the management API by providing a specially crafted regex to the ?name= filter. This vulnerability, known as Regular Expression Denial of Service (ReDoS), causes excessive CPU consumption and can saturate system schedulers, leading to a Denial of Service (DoS) for the affected system.
Package: rabbitmq-server4.2 (Red Hat Hardened Images) - Will not fix
Package: rabbitmq-server4.3 (Red Hat Hardened Images) - Affected
No detection rules found.
No public exploits indexed.
2026-09-23
Published