MediumCVE-2026-67413

    Rabbitmq-server: Inefficient Regular Expression Complexity (CVE-2026-67413)

    Published Last modified Sources: Red Hat, OSV, CVE.org, Msrc Update Guide, BSI

    What is affected, what to do

    A flaw was found in rabbitmq-server. An authenticated user with permissions to bind and publish messages can cause a Denial of Service (DoS) by submitting specially crafted pattern-matching expressions to the Java Message Service (JMS) topic exchange plugin.

    Update rabbitmq_server to version 4.1.14, RabbitMQ to version 4.3.3.

    Affected
    • Rabbitmq-server gte 4.0.0, < 4.0.23..*

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    6.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    6.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Red Hat, OSV, CVE.org, Msrc Update Guide, BSI

    0.5 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 42.2

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    75.52 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    6.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    6.5
    CVSS v4

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    6.0
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.5 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    42.2
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: proof of concept · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 29 September 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-1333

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A flaw was found in rabbitmq-server. An authenticated user with permissions to bind and publish messages can cause a Denial of Service (DoS) by submitting specially crafted pattern-matching expressions to the Java Message Service (JMS) topic exchange plugin. Because the message broker evaluates these regular expressions without recursion or execution limits, processing complex wildcards consumes excessive system processor resources, rendering the broker unresponsive to legitimate requests.

    Source: redhat_csaf, OSV (Open Source Vulnerabilities), NVD (NIST), cvelistv5, Microsoft Security Update Guide, BSI WID Portal, BSI CSAF

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    rabbitmqrabbitmq-server
    • ≥ 4.0.0, < 4.0.23
    • —
    broadcomrabbitmq_server
    • 4.1.0 – < 4.1.14
    • 4.0.0 – < 4.0.23
    • 4.3.0 – < 4.3.3
    • 4.2.0 – < 4.2.9
    • 4.1.14
    • 4.0.23
    • 4.3.3
    • 4.2.9
    Open SourceRabbitMQ
    • < 4.3.3
    • < 4.0.24
    • < 4.1.14
    • < 3.13.18
    • < 4.2.9
    • 4.3.3
    • 4.0.24
    • 4.1.14
    • 3.13.18
    • 4.2.9
    Distribution and container packages (4)

    Downstream packages (e.g. Bitnami, Debian, Ubuntu, Red Hat). Versions refer to the distribution, not the vendor.

    Distribution and container packages
    Affected versionsFixed in
    bitnamirabbitmq
    • 4.3.0
    • 4.2.0
    • 4.0.0
    • 4.1.0
    • —
    • —
    • —
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-1333Inefficient Regular Expression Complexity

      Base

      The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

      Entry at MITRE CWE-1333

    References & sources

    • github.comrabbitmq/rabbitmq-server/security/advisories/GHSA-chxf-3hfg-j8f7x_refsource_CONFIRM
    • github.comrabbitmq/rabbitmq-server/commit/20203c50ea6ff459d462b2d4355326d…x_refsource_MISC
    • github.comrabbitmq/rabbitmq-server/commit/60de2fbbcd812ab294985cef260cc2f…x_refsource_MISC
    • github.comrabbitmq/rabbitmq-server/commit/9e36b7f4c1e2eed77300288dca3e01b…x_refsource_MISC
    • github.comrabbitmq/rabbitmq-server/commit/f4d9da668b7304dfb9aeb2b4e9ff766…x_refsource_MISC
    • github.comrabbitmq/rabbitmq-server/releases/tag/v4.2.9x_refsource_MISC
    • github.comrabbitmq/rabbitmq-server/releases/tag/v4.3.3x_refsource_MISC
    • NVD (NIST)vuln/detail/CVE-2026-67413web

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Initial analysis by NVDNVD

      Newly listed as affected:
      • Broadcom RabbitMQ (4.1.0 – before 4.1.14; 4.2.0 – before 4.2.9; 4.3.0 – before 4.3.3; 4.0.0 – before 4.0.23)

      CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
      Product configurationadded
      —
      OR *cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:* versions from (including) 4.1.0 up to (excluding) 4.1.14 *cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:* versions from (including) 4.2.0 up to (excluding) 4.2.9 *cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:* versions from (including) 4.3.0 up to (excluding) 4.3.3 *cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.0.23
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/rabbitmq/rabbitmq-server/commit/20203c50ea6ff459d462b2d4355326d3a870682c Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/rabbitmq/rabbitmq-server/commit/60de2fbbcd812ab294985cef260cc2f1b1a02a5b Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/rabbitmq/rabbitmq-server/commit/9e36b7f4c1e2eed77300288dca3e01bd9b23c432 Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/rabbitmq/rabbitmq-server/commit/f4d9da668b7304dfb9aeb2b4e9ff766a1275d021 Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 Types: Release Notes
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 Types: Release Notes
      Reference typeadded
      —
      CISA-ADP: https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-chxf-3hfg-j8f7 Types: Exploit, Vendor Advisory
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-chxf-3hfg-j8f7 Types: Exploit, Vendor Advisory

      Source identifier: nvd@nist.gov

    2. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: proof of concept, automatable: no

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-chxf-3hfg-j8f7
      SSVC assessmentadded
      —
      {"id":"CVE-2026-67413","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T19:29:50.102995Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    3. ReceivedGitHub

      CVSS V4.0: AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

      Weakness type: CWE-1333

      Description added or changed

      Show 11 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.23, 4.1.14, 4.2.9, and 4.3.3, the optional rabbitmq_jms_topic_exchange plugin's x-jms-topic exchange accepted a client-controlled rjms_erlang_selector binding expression whose LIKE evaluator expanded percent and underscore wildcards into overlapping PCRE fragments. It executed those fragments with raw re:run/3 without match or recursion limits, allowing an authenticated tenant that can bind and publish to consume broker scheduler CPU and deny service with pathological selectors. This issue is fixed in versions 4.0.23, 4.1.14, 4.2.9, and 4.3.3.
      CVSSadded
      —
      AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
      Weakness type (CWE)added
      —
      CWE-1333
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/67xxx/CVE-2026-67413.json">CVE-2026-67413</a>
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/commit/20203c50ea6ff459d462b2d4355326d3a870682c
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/commit/60de2fbbcd812ab294985cef260cc2f1b1a02a5b
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/commit/9e36b7f4c1e2eed77300288dca3e01bd9b23c432
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/commit/f4d9da668b7304dfb9aeb2b4e9ff766a1275d021
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3
      Referenceadded
      —
      https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-chxf-3hfg-j8f7

      Source identifier: security-advisories@github.com

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