6.3

CVE-2026-63335: rabbitmq rabbitmq-java-client Improper Input Validation

CVSS: 6.3v4.0MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-63335DEBIAN-CVE-2026-63335CGA-24p9-4w8m-hf9r
Published 18-08-2026Last modified 18-08-2026
Open JSON

Vulnerability summary

CVE-2026-63335 is a medium (CVSS 6.3) Improper Input Validation vulnerability in rabbitmq rabbitmq-java-client. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 42.5% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.52%
0%100%
Low · +0.14 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-J3VX-RXJH-78VM

Timeline

  1. 18-08-2026
    PublishedVulnerability first disclosed.
  2. 18-08-2026
    Last modifiedVulnerability information updated.

Description

The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.31.0, inbound AMQP command assembly in src/main/java/com/rabbitmq/client/impl/CommandAssembler.java processes a content-bearing method and header whose remainingBodyBytes value is smaller than a following AMQP.FRAME_BODY payload. CommandAssembler.consumeBodyFrame subtracts the peer-controlled payload length before validating that it fits, drives remainingBodyBytes negative, and throws a raw UnsupportedOperationException instead of MalformedFrameException. A malicious or compromised broker peer can send this malformed sequence on an open nonzero channel to terminate frame processing and close the client connection, causing denial of service for work using that connection. This issue is fixed in version 5.31.0.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

+0.14 pp

From 0.37% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.52%

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

Chainguard24 products
  • cassandra-reaper< 5.0.0-r9
  • conductor< 3.32.1-r3
  • conductor-fips< 3.32.1-r1
  • druid< 37.0.0-r54 | < 37.0.0-r56
  • logstash-8.19< 8.19.20-r1
Wolfi9 products
  • cassandra-reaper< 5.0.0-r9
  • druid< 37.0.0-r54 | < 37.0.0-r56
  • logstash-9.3All versions (No fix recorded)
  • logstash-9.3-iamguarded-compatAll versions (No fix recorded)
  • logstash-9.4< 9.4.5-r3
Com.rabbitmq1 product
  • amqp-client< 5.31.0
Debian1 product
  • rabbitmq-java-clientAll versions (No fix recorded)
Rabbitmq1 product
Ubuntu1 product
  • rabbitmq-java-clientAll versions (No fix recorded)

6 vendors · 37 products

References

12 links
Show all 12 references