2.3

CVE-2026-67234: rabbitmq rabbitmq-server Improper Input Validation

CVSS: 2.3v4.0LowUndergoing analysis
AliasesUBUNTU-CVE-2026-67234DEBIAN-CVE-2026-67234
Published 25-09-2026Last modified 25-09-2026
Open JSON

Vulnerability summary

CVE-2026-67234 is a low (CVSS 2.3) Improper Input Validation vulnerability in rabbitmq rabbitmq-server. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.5% of scored vulnerabilities.

Overall risk
9/100
0100
Minimal · default modelHow is this calculated?
CVSS score
2.3/10
010
Low · v4.0 (CVE.org)
EPSS score
0.56%
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 4.2.0 until 4.2.8 and 4.3.2, get_auth_mechanism/1 used term_to_binary/1 on the strict_auth_mechanism or preferred_auth_mechanism atom when clearing the corresponding cookie, producing a non-ASCII cookie name that violates RFC 6265 and can prevent the browser from deleting the preference. The issue is not directly exploitable for code execution or data exfiltration; its security relevance is limited to stale authentication-mechanism preferences persisting across logout and login cycles. This issue is fixed in versions 4.2.8 and 4.3.2.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.56%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202619-10-2026
EPSS score
0.56%

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-server< 4.3.2-1
Rabbitmq1 product
Ubuntu1 product
  • rabbitmq-serverAll versions (No fix recorded)

3 vendors · 3 products

References

8 links