5.9

CVE-2026-67227: rabbitmq rabbitmq-server Uncontrolled Resource Consumption

CVSS: 5.9v4.0MediumUndergoing analysis
AliasesUBUNTU-CVE-2026-67227DEBIAN-CVE-2026-67227
Published 25-09-2026Last modified 25-09-2026
Open JSON

Vulnerability summary

CVE-2026-67227 is a medium (CVSS 5.9) Uncontrolled Resource Consumption vulnerability in rabbitmq rabbitmq-server. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.29%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:67552

Timeline

  1. 25-09-2026
    PublishedVulnerability first disclosed.
  2. 25-09-2026
    Last modifiedVulnerability information updated.

Description

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1, Atom exhaustion: toatom on global-parameter :name. resourceexists/2 (and the PUT/DELETE handlers) call rabbitdatacoercion:toatom/1 on the :name URL path segment. toatom/1 uses binarytoatom/2 (unsafe). The endpoint requires policymaker (not management, but below A user with the policymaker tag can crash the node by exhausting the atom table via repeated requests to /api/global-parameters/:name with unique :name Management plugin enabled policymaker tag ~1M HTTP. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202619-10-2026
EPSS score
0.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • rabbitmq-serverAll versions (No fix recorded) | < 4.3.2-1
Rabbitmq1 product
  • rabbitmq-server≥ 4.0.0, < 4.0.22 | ≥ 4.1.0, < 4.1.14 | ≥ 4.2.0, < 4.2.7 | ≥ 4.3.0, < 4.3.1
Ubuntu1 product
  • rabbitmq-serverAll versions (No fix recorded)

3 vendors · 3 products

References

8 links