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NVD / CVE Program· CNA apache

CVE-2026-50734: Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during wire format negotiation

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.74% (FIRST EPSS); higher than 55% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Apache Software Foundation Apache ActiveMQ 5.19.8, 6.2.7; Apache Software Foundation Apache ActiveMQ All 5.19.8, 6.2.7; Apache Software Foundation Apache ActiveMQ Client 5.19.8, 6.2.7.

Low priority for now. Upgrade to Apache Software Foundation Apache ActiveMQ 5.19.8, 6.2.7; Apache Software Foundation Apache ActiveMQ All 5.19.8, 6.2.7; Apache Software Foundation Apache ActiveMQ Client 5.19.8, 6.2.7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All. An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.

Published
Jun 30, 2026
Updated
Jul 2, 2026
EPSS
0.7% · 55th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-50734

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apacheactivemq

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache ActiveMQ

    • before 5.19.8affected · semver
    • 6.0.0 and later · before 6.2.7affected · semver

  • Apache Software Foundation Apache ActiveMQ All

    • before 5.19.8affected · semver
    • 6.0.0 and later · before 6.2.7affected · semver

  • Apache Software Foundation Apache ActiveMQ Client

    • before 5.19.8affected · semver
    • 6.0.0 and later · before 6.2.7affected · semver

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache activemqbefore 5.19.8
  • apache activemq6.0.0 and later · before 6.2.7

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12activemqfrom 0—
Mavenorg.apache.activemq:activemq-allfrom 6.0.0 · before 6.2.76.2.7
Mavenorg.apache.activemq:activemq-allbefore 5.19.85.19.8
Mavenorg.apache.activemq:activemq-clientfrom 6.0.0 · before 6.2.76.2.7
Mavenorg.apache.activemq:activemq-clientbefore 5.19.85.19.8
Mavenorg.apache.activemq:apache-activemqfrom 6.0.0 · before 6.2.76.2.7
Mavenorg.apache.activemq:apache-activemqbefore 5.19.85.19.8

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-46604Apache ActiveMQ, Apache ActiveMQ Legacy OpenWire Module: Unbounded deserialization causes ActiveMQ to be vulnerable to a remote code execution (RCE) attackKEV
    99Now
  • CVE-2016-3088The Fileserver web application in Apache ActiveMQ 5.x before 5.14.0 allows remote attackers to upload and execute arbitrary files via an…KEV
    99Now
  • CVE-2026-34197Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Authenticated users could perform RCE via Jolokia MBeansKEV
    94Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-49432Jun 30, 2026 · Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: STOMP negative content-length enables denial of service
    30Monitor
  • ← EarlierCVE-2026-49434Jun 30, 2026 · Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All: LdapNetworkConnector instantiates denied transports and a remote-properties broker
    30Monitor
  • Later →CVE-2026-50750Jun 30, 2026 · Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire DoS following fix for CVE-2026-49270
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Apache Software Foundation Apache ActiveMQ5.19.8Vendor (CNA)
Apache Software Foundation Apache ActiveMQ6.2.7Vendor (CNA)
Apache Software Foundation Apache ActiveMQ All5.19.8Vendor (CNA)
Apache Software Foundation Apache ActiveMQ All6.2.7Vendor (CNA)
Apache Software Foundation Apache ActiveMQ Client5.19.8Vendor (CNA)
Apache Software Foundation Apache ActiveMQ Client6.2.7Vendor (CNA)
Maven:org.apache.activemq:activemq-all5.19.8Package registry (OSV)
Maven:org.apache.activemq:activemq-all6.2.7Package registry (OSV)
Maven:org.apache.activemq:activemq-client5.19.8Package registry (OSV)
Maven:org.apache.activemq:activemq-client6.2.7Package registry (OSV)
Maven:org.apache.activemq:apache-activemq5.19.8Package registry (OSV)
Maven:org.apache.activemq:apache-activemq6.2.7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-539160 days apartApache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: Unbounded header buffer in STOMP NIO codec
    30Monitor
  • CVE-2026-539170 days apartApache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker: Unbounded memory allocation in OpenWire property unmarshalling
    30Monitor
  • CVE-2025-27533419 days apartApache ActiveMQ: Unchecked buffer length can cause excessive memory allocation
    30Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-789 · Memory Allocation with Excessive Size Value

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records