BlackTreeCVE Intelligence
← Back to the CVE catalogue
Full vulnerability report · 2026
CVE-2026-49432High confidence

Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: STOMP negative content-length enables denial of service

Apache Software Foundation · Apache ActiveMQ

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archiveactivemqUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 11 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-49432 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityorg.apache.activemq/activemq: org.apache.activemq/activemq-all: org.apache.activemq/activemq-stomp: Apache ActiveMQ: Denial of Service via improper input validation in STOMP connector
121 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • activemq-artemis-native as a component of Red Hat AMQ Broker 7
  • activemq-client as a component of Red Hat AMQ Broker 7
  • activemq-openwire-legacy as a component of Red Hat AMQ Broker 7
  • apache-artemis as a component of Red Hat AMQ Broker 7
  • artemis-amqp-protocol as a component of Red Hat AMQ Broker 7
  • artemis-boot as a component of Red Hat AMQ Broker 7
  • artemis-cli as a component of Red Hat AMQ Broker 7
  • artemis-commons as a component of Red Hat AMQ Broker 7
  • artemis-console as a component of Red Hat AMQ Broker 7
  • artemis-console-war as a component of Red Hat AMQ Broker 7
  • artemis-core-client as a component of Red Hat AMQ Broker 7
  • artemis-dto as a component of Red Hat AMQ Broker 7
Summary
A flaw was found in Apache ActiveMQ. A remote, unauthenticated attacker can exploit an improper input validation vulnerability by sending a specially crafted message with a negative content-length to an exposed STOMP connector. This can lead to a denial of service (DoS) condition, either by consuming excessive memory and causing an Out-Of-Memory (OOM) error or by forcing the abnormal closure of affected connections.
Remediation
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings. The References section of this erratum contains a download link (you must log in to download the update).
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-40284

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp. A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. This issue affects 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; Apache ActiveMQ Stomp: 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.

What

Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp. A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. This issue affects 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; Apache ActiveMQ Stomp: 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.

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp. A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. This issue affects 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; Apache ActiveMQ Stomp: 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.

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Input Validation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-20 ↗

CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-20
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-3043IBM QRadar SIEM: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen und um beliebigen Programmcode auszuführen.

Official advisory ↗
BSI · German · WID-SEC-2026-2124Apache ActiveMQ: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Apache ActiveMQ ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen oder einen Denial-of-Service-Zustand zu verursachen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260701Security Bulletin 1 July 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 1 July 2026, published on 1 July 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1094Multiples vulnérabilités dans les produits IBM

ord?id=CVE-2026-48713 Référence CVE CVE-2026-48775 https://www.cve.org/CVERecord?id=CVE-2026-48775 Référence CVE CVE-2026-48779 https://www.cve.org/CVERecord?id=CVE-2026-48779 Référence CVE CVE-2026-4878 https://www.cve.org/CVERecord?id=CVE-2026-4878 Référence CVE CVE-2026-48801 https://www.cve.org/CVERecord?id=CVE-2026-48801 Référence CVE CVE-2026-48864 https://www.cve.org/CVERecord?id=CVE-2026-48864 Référence CVE CVE-2026-48988 https://www.cve.org/CVERecord?id=CVE-2026-48988 Référence CVE CVE-2026-49157 https://www.cve.org/CVERecord?id=CVE-2026-49157 Référence CVE CVE-2026-49270 https://www.cve.org/CVERecord?id=CVE-2026-49270 Référence CVE CVE-2026-49432 https://www.cve.org/CVERecord?id=CVE-2026-49432 Référence CVE CVE-2026-49434 https://www.cve.org/CVERecord?id=CVE-2026-49434 Référence CVE CVE-2026-49458 https://www.cve.org/CVERecord?id=CVE-2026-49458 Référence CVE CVE-2026-49459 https://www.cve.org/CVERecord?id=CVE-2026-49459 Référence CVE CVE-2026-49476 https://www.cve.org/CVERecord?id=CVE-2026-49476 Référence CVE CVE-2026-49477 https://www.cve.org/CVERecord?id=CVE-2026-49477 Référence CVE CVE-2026-49844 https://www.cve.org/CVERecord?id=CVE-2026-49844 Référence CVE CVE-2026-49978 https://www.cve.org/CVERecord?id=CVE-2026-49978 Référence CVE CVE-2026-5038 https://www.cve.org/CVERecord?id=C

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0986Multiples vulnérabilités dans les produits IBM

CVERecord?id=CVE-2026-47059 Référence CVE CVE-2026-47063 https://www.cve.org/CVERecord?id=CVE-2026-47063 Référence CVE CVE-2026-4890 https://www.cve.org/CVERecord?id=CVE-2026-4890 Référence CVE CVE-2026-4891 https://www.cve.org/CVERecord?id=CVE-2026-4891 Référence CVE CVE-2026-4892 https://www.cve.org/CVERecord?id=CVE-2026-4892 Référence CVE CVE-2026-4893 https://www.cve.org/CVERecord?id=CVE-2026-4893 Référence CVE CVE-2026-48962 https://www.cve.org/CVERecord?id=CVE-2026-48962 Référence CVE CVE-2026-48978 https://www.cve.org/CVERecord?id=CVE-2026-48978 Référence CVE CVE-2026-49268 https://www.cve.org/CVERecord?id=CVE-2026-49268 Référence CVE CVE-2026-49432 https://www.cve.org/CVERecord?id=CVE-2026-49432 Référence CVE CVE-2026-49434 https://www.cve.org/CVERecord?id=CVE-2026-49434 Référence CVE CVE-2026-50151 https://www.cve.org/CVERecord?id=CVE-2026-50151 Référence CVE CVE-2026-50162 https://www.cve.org/CVERecord?id=CVE-2026-50162 Référence CVE CVE-2026-50163 https://www.cve.org/CVERecord?id=CVE-2026-50163 Référence CVE CVE-2026-50645 https://www.cve.org/CVERecord?id=CVE-2026-50645 Référence CVE CVE-2026-50734 https://www.cve.org/CVERecord?id=CVE-2026-50734 Référence CVE CVE-2026-53916 https://www.cve.org/CVERecord?id=CVE-2026-53916 Référence CVE CVE-2026-53917 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-022358Apache Software FoundationのApache ActiveMQにおける入力確認に関する脆弱性

Apache ActiveMQ、Apache ActiveMQ All、Apache ActiveMQ Stompにおける不適切な入力検証の脆弱性があります。リモートの認証されていないピアが公開されているSTOMPコネクタにアクセス可能な場合、負のコンテント長を送信することでサービス拒否（DoS）を引き起こすことができます。NIO STOMPトランスポートでは、攻撃者がボディバイトのストリーミングを継続し、接続ごとのコマンドバッファを設定された制限を超えて増大させることでOOM（アウト・オブ・メモリ）を引き起こす可能性があります。ブロッキングSTOMPプロトコルの場合は、エラーによって影響を受けた接続に対して異常なトランスポート例外処理が強制され、その結果接続が閉じられます。本問題はApache ActiveMQ バージョン5.19.8未満および6.0.0から6.2.7未満、Apache ActiveMQ All バージョン5.19.8未満および6.0.0から6.2.7未満、Apache ActiveMQ Stomp バージョン5.19.8未満および6.0.0から6.2.7未満に影響を及ぼします。ユーザーは、本問題を修正したバージョン6.2.7または5.19.8にアップグレードすることを推奨します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings. The References section of this erratum contains a download link (you must log in to download the update).
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 30 Jun 2026 · Last source change 30 Jun 2026, 15:55 UTC · CWE-20 · Improper Input Validation

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-40284
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-40284↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-49432 · cve.blacktree.nl