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Medium 2 vendors · 2 advisories

CVE-2026-103582: Apache ActiveMQ NMS OpenWire Client Library: Unbounded/Unvalidated Length Fields in Apache.NMS.OpenWire Unmarshalling (DoS)

CVE-2026-103582 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Medium
CVSS base score
5.9 (Red Hat)
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · base score 7.5, scored by CISA-ADPAttack vector: network. Attack complexity: low. Privileges required: none. User interaction: none. Scope: unchanged. Confidentiality impact: none. Integrity impact: none. Availability impact: high.
Weakness
  • CWE-789 Memory allocation with excessive size value
CISA SSVC
Exploitation: none observed. Automatable: yes. Technical impact: partial. CISA, .
Fixed releases
  • Apache: 2.3.0
  • Red Hat: 2.3.0
Vendor advisories
2 from Apache, Red Hat
Assigned by
apache (CNA)
CVE record published
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-103582; each belongs to its advisory, not to every product listed. How records are collected and checked.

Description

Unbounded memory allocation and missing frame size validation in Apache NMS ActiveMQ (the .NET OpenWire client, package Apache.NMS.ActiveMQ) before 2.3.0. The OpenWire unmarshalling code trusted the frame size and the length and count fields read from the network. It did not enforce a maximum frame size, and it did not check that decoded lengths fit within the frame being read. A malicious or compromised broker, or an attacker able to intercept and modify an unencrypted connection, could send a crafted OpenWire frame with an oversized or negative length. This could cause the client to attempt very large memory allocations, leading to excessive memory consumption, an OutOfMemoryException or an uncaught exception, and a denial of service of the client application. Users are recommended to upgrade to version 2.3.0, which enforces a configurable maximum frame size and validates lengths against the size of the frame being read.

Text from the CVE.org record (apache).

How do I fix CVE-2026-103582?

Upgrade to a fixed release named by the vendor:

  • Apache: 2.3.0
  • Red Hat: 2.3.0
  • Users are recommended to upgrade to version 2.3.0, which enforces a configurable maximum frame size and validates lengths against the size of the frame being read. (Apache)

Vendor advisories for CVE-2026-103582

Apache

1 advisory
  • Advisory severityUnrated

    Advisory [CVE-2026-103582] Unbounded memory allocation and missing frame size validation in Apache NMS ActiveMQ (the.NET OpenWire client, package Apache.NMS.ActiveMQ) before 2.3.0

    CVE-2026-103582Source published Source updated

    Unbounded memory allocation and missing frame size validation in Apache NMS ActiveMQ (the.NET OpenWire client, package Apache.NMS.ActiveMQ) before 2.3.0. The OpenWire unmarshalling code trusted the frame size and the length and count fields read from the network. It did not enforce a maximum frame size, and it did not check that decoded lengths fit within the frame being read. A malicious or compromised broker, or an attacker able to intercept and modify an unencrypted connection, could send a crafted OpenWire frame with an oversized or negative length. This could cause the client to attempt very large memory allocations, leading to excessive memory consumption, an OutOfMemoryException or an uncaught exception, and a denial of service of the client application. Users are recommended to…

    Affected products in this advisory
    • Apache ActiveMQ NMS OpenWire Client Library
    Source-reported affected versions
    • Apache ActiveMQ NMS OpenWire Client Library through 2.2.0
    Source-reported fixed versions
    • 2.3.0
    Mitigation guidance
    • Users are recommended to upgrade to version 2.3.0, which enforces a configurable maximum frame size and validates lengths against the size of the frame being read.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory

References

Timeline

  1. CVE record published
  2. First vendor advisory listed by VulniPulse
  3. CVE record last updated

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