7.5

CVE-2026-39304: apache software foundation apache activemq Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2026-39304DEBIAN-CVE-2026-39304CGA-4c39-mv27-mrxf
Published 10-04-2026Last modified 15-07-2026
Open JSON

Vulnerability summary

CVE-2026-39304 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in apache software foundation apache activemq. EPSS estimates a 1.06% chance of exploitation in the next 30 days, higher than 64.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.06%
0%100%
Low · +0.17 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-298V-WQ6Q-HHJ9

Timeline

  1. 10-04-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

Description

Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ. ActiveMQ NIO SSL transports do not correctly handle TLSv1.3 handshake KeyUpdates triggered by clients. This makes it possible for a client to rapidly trigger updates which causes the broker to exhaust all its memory in the SSL engine leading to DoS. Note: TLS versions before TLSv1.3 (such as TLSv1.2) are broken but are not vulnerable to OOM. Previous TLS versions require a full handshake renegotiation which causes a connection to hang but not OOM. This is fixed as well. This issue affects Apache ActiveMQ Client: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.4. Users are recommended to upgrade to version 6.2.4 or 5.19.5, which fixes the issue.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

1.06%

Chance of exploitation in the next 30 days

Percentile

64%

Versus all other CVEs

30-day change

+0.17 pp

From 0.90% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.06%

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

Chainguard6 products
  • apache-activemq-6.1All versions (No fix recorded)
  • apache-activemq-artemis< 2.53.0-r5
  • apache-activemq-fips-6.1All versions (No fix recorded)
  • geoserver-2.27-community< 2.27.5-r3
  • geoserver-2.28-community< 2.28.3-r1
Apache software foundation4 products
Org.apache.activemq4 products
  • activemq-all< 5.19.4 | ≥ 6.0.0, < 6.2.4
  • activemq-broker< 5.19.4 | ≥ 6.0.0, < 6.2.4
  • activemq-client< 5.19.4 | ≥ 6.0.0, < 6.2.4
  • apache-activemq< 5.19.4 | ≥ 6.0.0, < 6.2.4
Apache2 products
Wolfi2 products
  • apache-activemq-artemis< 2.53.0-r5
  • zipkin< 3.6.1-r3
Debian1 product
  • activemqAll versions (No fix recorded)
Ubuntu1 product
  • activemqAll versions (No fix recorded)

7 vendors · 20 products

References

13 links
Show all 13 references