6.9

CVE-2026-67226: rabbitmq rabbitmq-server Uncontrolled Resource Consumption

CVSS: 6.9v4.0MediumUndergoing analysis
AliasesUBUNTU-CVE-2026-67226DEBIAN-CVE-2026-67226
Published 25-09-2026Last modified 25-09-2026
Open JSON

Vulnerability summary

CVE-2026-67226 is a medium (CVSS 6.9) Uncontrolled Resource Consumption vulnerability in rabbitmq rabbitmq-server. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.5% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.35%
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, Admin-only atom exhaustion: PUT /api/users tags list. settags/2 maps rabbitdatacoercion:toatom/1 over the user's tags list. The 20 MB management body limit fits ~3-4M short tag strings. An administrator can crash the node in a single request by creating a user (or importing definitions) with ~1M unique tag administrator. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202619-10-2026
EPSS score
0.35%

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) | < 4.3.0-2
Rabbitmq1 product
  • rabbitmq-server≥ 4.0.0, < 4.0.22 | ≥ 4.1.0, < 4.1.14 | ≥ 4.2.0, < 4.2.7
Ubuntu1 product
  • rabbitmq-serverAll versions (No fix recorded)

3 vendors · 3 products

References

6 links