CVE-2026-59878

Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All: AMQP NIO negative frame size validation bypass leading to DoS

HIGH

7.5

CVSS Score

Published: July 28, 2026 at 01:33 PM UTC

Updated: August 5, 2026 at 07:04 PM UTC

3 products affected across 1 vendorActiveMQActiveMQ AllActivemq Amqp

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Severity

HIGH7.5

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

ActiveMQ · Apachemaven

95%

v < 5.19.96.0.0 ≤ v < 6.2.86.0.0

Affected range stops below 5.19.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2.8, so it looks safe — our inference, not a vendor statement

ActiveMQ All · Apachemaven

95%

v < 5.19.96.0.0 ≤ v < 6.2.86.0.0

Affected range stops below 5.19.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2.8, so it looks safe — our inference, not a vendor statement

Activemq Amqp · Apachemaven

95%

v < 5.19.96.0.0 ≤ v < 6.2.86.0.0

Affected range stops below 5.19.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://lists.apache.org/thread/dnyx4d2oldshcj4lthso7b53y4bqmjvn

References (2)

Vendor AdvisoryMailing List

Source: cverecord

https://lists.apache.org/thread/dnyx4d2oldshcj4lthso7b53y4bqmjvn

Mailing ListThird Party Advisory

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2026/07/27/7

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-20

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