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High 2 vendors · 2 advisories

CVE-2026-19534: DoS (Denial of Service) undici Dependency in Jira Software Data Center

CVE-2026-19534 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
High
CVSS base score
7.5 (Atlassian), 7.5 (Red Hat)
Fixed releases
  • Atlassian: Jira Data Center and Server: 11.3.12 (LTS) recommended Data Center Only, Jira Data Center and Server: 10.3.26 (LTS) Data Center Only, Jira Service Management Data Center and Server: 11.3.12 (LTS) recommended Data Center Only, Jira Service Management Data Center and Server: 10.3.26 (LTS) Data Center Only
  • Red Hat: 6.28.1, 7.29.1, 8.10.2, nodejs24-1:24.21.0-1.el10_2, nodejs22-1:22.23.2-3.el10_2, nodejs:24-8100020260921144227.6d880403 and 35 more in the advisory
Vendor advisories
2 from Atlassian, Red Hat
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-19534; each belongs to its advisory, not to every product listed. How records are collected and checked.

How do I fix CVE-2026-19534?

Upgrade to a fixed release named by the vendor:

  • Atlassian: Jira Data Center and Server: 11.3.12 (LTS) recommended Data Center Only, Jira Data Center and Server: 10.3.26 (LTS) Data Center Only, Jira Service Management Data Center and Server: 11.3.12 (LTS) recommended Data Center Only, Jira Service Management Data Center and Server: 10.3.26 (LTS) Data Center Only
  • Red Hat: 6.28.1, 7.29.1, 8.10.2, nodejs24-1:24.21.0-1.el10_2, nodejs22-1:22.23.2-3.el10_2, nodejs:24-8100020260921144227.6d880403
  • Upgrade to a fixed version listed by Atlassian: Jira Data Center and Server: 11.3.12 (LTS) recommended Data Center Only; Jira Data Center and Server: 10.3.26 (LTS) Data Center Only; Jira Service Management Data Center and Server: 11.3.12 (LTS) recommended Data Center Only; Jira Service Management Data Center and Server: 10.3.26 (LTS) Data Center Only. (Atlassian)
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (Red Hat)

Vendor advisories for CVE-2026-19534

Atlassian

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-19534] DoS (Denial of Service) undici Dependency in Jira Software Data Center

    CVE-2026-19534Source published

    DoS (Denial of Service) undici Dependency in Jira Software Data Center. Affected: Jira Data Center and Server, Jira Service Management Data Center and Server. Listed in Atlassian's Security Bulletin of October 20 2026.

    Affected products in this advisory
    • Jira Data Center and Server
    • Jira Service Management Data Center and Server
    Source-reported affected versions
    • Jira Data Center and Server: 11.3.0 to 11.3.11 (LTS)
    • Jira Data Center and Server: 11.2.0 to 11.2.1
    • Jira Data Center and Server: 11.1.0 to 11.1.1
    • Jira Data Center and Server: 11.0.0 to 11.0.1

    12 more entries in the full advisory.

    Source-reported fixed versions
    • Jira Data Center and Server: 11.3.12 (LTS) recommended Data Center Only
    • Jira Data Center and Server: 10.3.26 (LTS) Data Center Only
    • Jira Service Management Data Center and Server: 11.3.12 (LTS) recommended Data Center Only
    • Jira Service Management Data Center and Server: 10.3.26 (LTS) Data Center Only
    Mitigation guidance
    • Upgrade to a fixed version listed by Atlassian: Jira Data Center and Server: 11.3.12 (LTS) recommended Data Center Only; Jira Data Center and Server: 10.3.26 (LTS) Data Center Only; Jira Service Management Data Center and Server: 11.3.12 (LTS) recommended Data Center Only; Jira Service Management Data Center and Server: 10.3.26 (LTS) Data Center Only.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-19534] Denial of Service via unrequested WebSocket subprotocol

    CVE-2026-19534Source published Source updated

    undici's WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested. A default WebSocket connection sends no subprotocol, but if the server's 101 response includes a Sec-WebSocket-Protocol header, undici dereferences a null value while checking it against the requested list and throws an uncaught TypeError. Because that code runs inside a microtask with no surrounding error handling, the exception propagates and terminates the process under Node's default behavior, instead of gracefully failing the connection as required by the WebSocket protocol. Any application that opens a WebSocket to an attacker-controlled or compromised server, or over a plaintext connection subject to a…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 9
    • Cluster Observability Operator 1.5.3

    16 more entries in the full advisory.

    Source-reported affected versions
    • 6.7.0
    • 7.0.0
    • 8.0.0
    Source-reported fixed versions
    • 6.28.1
    • 7.29.1
    • 8.10.2
    • nodejs24-1:24.21.0-1.el10_2

    37 more entries in the full advisory.

    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

References

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