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Vulnerability · Published Jul 28, 2026 · Assigned by apache

CVE-2026-59878Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All: AMQP NIO negative frame size validation bypass leading to DoS

High 7.5

In plain English

A high-severity improper input validation in Apache ActiveMQ from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 43.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Improper Input Validation vulnerability in Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All. A remote unauthenticated peer that can reach an exposed AMQP NIO connector can trigger denial-of-service behavior by sending a frame size value. This cause the NIO threads to die and if done rapidly enough can lead to exhaustion of the NIO thread pool denying service to other connections. This issue affects Apache ActiveMQ AMQP: before 5.19.9, from 6.0.0 before 6.2.8; Apache ActiveMQ: before 5.19.9, from 6.0.0 before 6.2.8; Apache ActiveMQ All: before 5.19.9, from 6.0.0 before 6.2.8. Users are recommended to upgrade to version 5.19.9, 6.2.8, or 6.3.0 which fixes the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12activemqno fix listedDEBIAN-CVE-2026-59878
Debian:13activemqno fix listedDEBIAN-CVE-2026-59878
Ubuntu:24.04:LTSactivemqno fix listedUBUNTU-CVE-2026-59878
Ubuntu:26.04:LTSactivemqno fix listedUBUNTU-CVE-2026-59878
Ubuntu:26.10activemqno fix listedUBUNTU-CVE-2026-59878

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache ActiveMQ AMQP 0 – before 5.19.96.0.0 – before 6.2.8
Apache Software Foundation Apache ActiveMQ 0 – before 5.19.96.0.0 – before 6.2.8
Apache Software Foundation Apache ActiveMQ All 0 – before 5.19.96.0.0 – before 6.2.8

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References