6.5

CVE-2026-66071: broadcom rabbitmq_server Uncontrolled Resource Consumption

CVSS: 6.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-66071DEBIAN-CVE-2026-66071
Published 25-09-2026Last modified 25-09-2026
Open JSON

Vulnerability summary

CVE-2026-66071 is a medium (CVSS 6.5) Uncontrolled Resource Consumption vulnerability in broadcom rabbitmq_server. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.47%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

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 3.13.0 until 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1, Atom exhaustion: OAuth2 JWT tag: scope values. extractscopes/1 parses scopes of the form .tag: and calls rabbitdatacoercion:toatom() to convert to a tag atom. The token signature is verified first, so the attacker cannot forge scopes , but in IdP configurations where scope content is user-influenced, each login with a novel tag value leaks one In deployments where users can influence the scopes included in their IdP-issued JWT rabbitmqauthbackendoauth2 enabled IdP permits attacker-influenced scope values in signed tokens. This issue is fixed in versions 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202618-10-2026
EPSS score
0.47%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Rabbitmq Server

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Broadcom1 product
  • rabbitmq_server≥ 3.13.0, < 3.13.15 | ≥ 4.0.0, < 4.0.22 | ≥ 4.1.0, < 4.1.11 | ≥ 4.2.0, < 4.2.6 | ≥ 4.3.0, < 4.3.1
Debian1 product
  • rabbitmq-serverAll versions (No fix recorded) | < 4.3.2-1
Rabbitmq1 product
  • rabbitmq-server≥ 3.13.0, < 3.13.15 | ≥ 4.0.0, < 4.0.22 | ≥ 4.1.0, < 4.1.11 | ≥ 4.2.0, < 4.2.6 | ≥ 4.3.0, < 4.3.1
Ubuntu1 product
  • rabbitmq-serverAll versions (No fix recorded)

4 vendors · 4 products

References

8 links