CVE-2026-54428: Atlassian DoS (Denial of Service) org.apache.httpcomponents.core5:httpcore5-h2 Dependency in Bitbucket Data Center
This Atlassian advisory covers CVE-2026-54428 in Bitbucket Data Center and Server and Crowd Data Center and Server.
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Bitbucket Data Center and Server: 10.5.0; Bitbucket Data Center and Server: 10.4.1 to 10.4.3; Bitbucket Data Center and Server: 10.3.0 to 10.3.2 and 13 more below
- Fixed in
- Bitbucket Data Center and Server: 10.5.1 Data Center Only, Bitbucket Data Center and Server: 10.2.8 (LTS) recommended Data Center Only, Bitbucket Data Center and Server: 9.4.26 (LTS) Data Center Only and 1 more below
- 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) org.apache.httpcomponents.core5:httpcore5-h2 Dependency in Bitbucket Data Center. Affected: Bitbucket Data Center and Server, Crowd Data Center and Server.
Listed in Atlassian's Security Bulletin of October 20 2026.
Text from the source record.
- Bitbucket Data Center and Server: 10.5.0
- Bitbucket Data Center and Server: 10.4.1 to 10.4.3
- Bitbucket Data Center and Server: 10.3.0 to 10.3.2
- Bitbucket Data Center and Server: 10.2.0 to 10.2.7 (LTS)
- Bitbucket Data Center and Server: 10.1.1 to 10.1.5
- Bitbucket Data Center and Server: 10.0.0 to 10.0.2
- Bitbucket Data Center and Server: 9.6.0 to 9.6.5
- Bitbucket Data Center and Server: 9.5.0 to 9.5.2
- Bitbucket Data Center and Server: 9.4.0 to 9.4.24 (LTS)
- Bitbucket Data Center and Server: 9.3.0 to 9.3.2
- Crowd Data Center and Server: 7.2.0 to 7.2.3
- Crowd Data Center and Server: 7.1.0 to 7.1.7
- Crowd Data Center and Server: 7.0.0 to 7.0.3
- Crowd Data Center and Server: 6.3.0 to 6.3.7
- Crowd Data Center and Server: 6.2.0 to 6.2.6
- Crowd Data Center and Server: 6.1.2 to 6.1.7
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-54428
Upgrade to a fixed release named by Atlassian:
- Bitbucket Data Center and Server: 10.5.1 Data Center Only
- Bitbucket Data Center and Server: 10.2.8 (LTS) recommended Data Center Only
- Bitbucket Data Center and Server: 9.4.26 (LTS) Data Center Only
- Crowd Data Center and Server: 7.2.4 recommended Data Center Only
Vendor guidance
- Upgrade to a fixed version listed by Atlassian: Bitbucket Data Center and Server: 10.5.1 Data Center Only; Bitbucket Data Center and Server: 10.2.8 (LTS) recommended Data Center Only; Bitbucket Data Center and Server: 9.4.26 (LTS) Data Center Only; Crowd Data Center and Server: 7.2.4 recommended Data Center Only.
CVE-2026-54428 in other vendors' advisories
- Apache: CVE-2026-54428, high severity
- Red Hat: CVE-2026-54428, high severity, fixed in cryostat/cryostat-agent-init-rhel9:0.7.0-12, cryostat/cryostat-rhel9:4.2.0-14, org.apache.httpcomponents.core5/httpcore5-h2:5.3.6.redhat-00002 and 31 more
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