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High 2 vendors · 2 advisories

CVE-2026-59869: DoS (Denial of Service) js-yaml Dependency in Jira Software Data Center

CVE-2026-59869 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
High
CVSS base score
7.5 (Atlassian), 7.5 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (Red Hat)
Weakness
CWE-606
Fixed releases
  • Atlassian: Jira Data Center and Server: 11.3.11 (LTS) recommended Data Center Only, Jira Data Center and Server: 10.3.25 (LTS) Data Center Only, Jira Service Management Data Center and Server: 11.3.11 (LTS) recommended Data Center Only, Jira Service Management Data Center and Server: 10.3.25 (LTS) Data Center Only
  • Red Hat: 3.15.0, 4.3.0, cryostat/cryostat-grafana-dashboard-rhel9:4.2.0-14, cryostat/cryostat-openshift-console-plugin-rhel9:4.2.0-14, js-yaml, automation-gateway-0:2.5.20260923-1.el8ap and 44 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-2026-59869; each belongs to its advisory, not to every product listed. How records are collected and checked.

How do I fix CVE-2026-59869?

Upgrade to a fixed release named by the vendor:

  • Atlassian: Jira Data Center and Server: 11.3.11 (LTS) recommended Data Center Only, Jira Data Center and Server: 10.3.25 (LTS) Data Center Only, Jira Service Management Data Center and Server: 11.3.11 (LTS) recommended Data Center Only, Jira Service Management Data Center and Server: 10.3.25 (LTS) Data Center Only
  • Red Hat: 3.15.0, 4.3.0, cryostat/cryostat-grafana-dashboard-rhel9:4.2.0-14, cryostat/cryostat-openshift-console-plugin-rhel9:4.2.0-14, js-yaml, automation-gateway-0:2.5.20260923-1.el8ap
  • Upgrade to a fixed version listed by Atlassian: Jira Data Center and Server: 11.3.11 (LTS) recommended Data Center Only; Jira Data Center and Server: 10.3.25 (LTS) Data Center Only; Jira Service Management Data Center and Server: 11.3.11 (LTS) recommended Data Center Only; Jira Service Management Data Center and Server: 10.3.25 (LTS) Data Center Only. (Atlassian)
  • To reduce exposure, restrict the processing of untrusted YAML documents by applications that rely on `js-yaml`. Implement robust input validation and sanitization for all YAML data originating from external or untrusted sources. Consider limiting network access to services that parse YAML content to trusted networks or clients through appropriate firewall configurations. (Red Hat)

Vendor advisories for CVE-2026-59869

Atlassian

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-59869] DoS (Denial of Service) js-yaml Dependency in Jira Software Data Center

    CVE-2026-59869Source published

    DoS (Denial of Service) js-yaml 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 September 15 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 11.3.10 (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: 11.3.11 (LTS) recommended Data Center Only
    • Jira Data Center and Server: 10.3.25 (LTS) Data Center Only
    • Jira Service Management Data Center and Server: 11.3.11 (LTS) recommended Data Center Only
    • Jira Service Management Data Center and Server: 10.3.25 (LTS) Data Center Only
    Mitigation guidance
    • Upgrade to a fixed version listed by Atlassian: Jira Data Center and Server: 11.3.11 (LTS) recommended Data Center Only; Jira Data Center and Server: 10.3.25 (LTS) Data Center Only; Jira Service Management Data Center and Server: 11.3.11 (LTS) recommended Data Center Only; Jira Service Management Data Center and Server: 10.3.25 (LTS) Data Center Only.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-59869] Denial of Service via crafted YAML documents

    CVE-2026-59869Source published Source updated

    js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0. A remote attacker could exploit this vulnerability by providing a specially crafted YAML document containing a chain of mappings with merge keys. This could cause the parser to consume excessive CPU resources, leading to a Denial of Service (DoS) for the affected system. This vulnerability is rated as Important. Red Hat products utilizing `js-yaml` to process untrusted YAML input are susceptible to a denial of service, as a remote attacker can provide a crafted document…

    Affected products in this advisory
    • Cryostat 4 on RHEL 9
    • Red Hat AMQ Broker 7.13.6
    • Red Hat AMQ Broker 7.14.1
    • Red Hat Ansible Automation Platform 2.5 for RHEL 8

    44 more entries in the full advisory.

    Source-reported affected versions
    • < 3.0.0
    • < 3.15.0
    • < 4.0.0
    • < 4.3.0
    Source-reported fixed versions
    • 3.15.0
    • 4.3.0
    • cryostat/cryostat-grafana-dashboard-rhel9:4.2.0-14
    • cryostat/cryostat-openshift-console-plugin-rhel9:4.2.0-14

    46 more entries in the full advisory.

    Mitigation guidance
    • To reduce exposure, restrict the processing of untrusted YAML documents by applications that rely on `js-yaml`. Implement robust input validation and sanitization for all YAML data originating from external or untrusted sources. Consider limiting network access to services that parse YAML content to trusted networks or clients through appropriate firewall configurations.
    Full advisory and evidenceOpen source bulletin

References

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