CVE-2026-59887: Atlassian DoS (Denial of Service) linkify-it Dependency in Jira Service Management Data Center
This Atlassian advisory covers CVE-2026-59887 in Jira Service Management Data Center and Server.
- CVE-2026-59887
Key facts
- Vendor rating
- High, CVSS 7.5
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H· base score 7.5, scored by GitHub_MAttack vector: network. Attack complexity: low. Privileges required: none. User interaction: none. Scope: unchanged. Confidentiality impact: none. Integrity impact: none. Availability impact: high.- Weakness
- CWE-407: Inefficient Algorithmic Complexity
- CISA SSVC
- Exploitation: proof of concept exists. Automatable: yes. Technical impact: partial. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Jira Service Management Data Center and Server: 11.3.0 to 11.3.10 (LTS); Jira Service Management Data Center and Server: 11.2.0 to 11.2.1; Jira Service Management Data Center and Server: 11.1.0 to 11.1.1 and 9 more below
- Fixed in
- 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
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
DoS (Denial of Service) linkify-it Dependency in Jira Service Management Data Center. Affected: Jira Service Management Data Center and Server.
Listed in Atlassian's Security Bulletin of September 15 2026.
Text from the source record.
- Jira Service Management Data Center and Server: 11.3.0 to 11.3.10 (LTS)
- Jira Service Management Data Center and Server: 11.2.0 to 11.2.1
- Jira Service Management Data Center and Server: 11.1.0 to 11.1.1
- Jira Service Management Data Center and Server: 11.0.0 to 11.0.1
- Jira Service Management Data Center and Server: 10.7.1 to 10.7.4
- Jira Service Management Data Center and Server: 10.6.0 to 10.6.1
- Jira Service Management Data Center and Server: 10.5.0 to 10.5.1
- Jira Service Management Data Center and Server: 10.4.0 to 10.4.1
- Jira Service Management Data Center and Server: 10.3.0 to 10.3.24 (LTS)
- Jira Service Management Data Center and Server: 10.2.0 to 10.2.1
- Jira Service Management Data Center and Server: 10.1.1 to 10.1.2
- Jira Service Management Data Center and Server: 5.17.3 to 5.17.5
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-59887
Upgrade to a fixed release named by Atlassian:
- 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
Vendor guidance
- Upgrade to a fixed version listed by Atlassian: 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.
Support dates for the fixed release lines
- Atlassian Jira 11.3: support ends
- Atlassian Jira 10.3: support ends
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