CVE-2026-42583: Atlassian DoS (Denial of Service) io.netty:netty-codec Dependency in Bitbucket Data Center
This Atlassian advisory covers CVE-2026-42583 in Bitbucket Data Center and Server.
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Bitbucket Data Center and Server: 10.4.1; Bitbucket Data Center and Server: 10.3.0 to 10.3.2; Bitbucket Data Center and Server: 10.2.0 to 10.2.5 (LTS) and 7 more below
- Fixed in
- Bitbucket Data Center and Server: 10.4.2 to 10.4.3 Data Center Only, Bitbucket Data Center and Server: 10.2.6 to 10.2.7 (LTS) recommended Data Center Only, Bitbucket Data Center and Server: 9.4.24 (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) io.netty:netty-codec Dependency in Bitbucket Data Center. Affected: Bitbucket Data Center and Server.
Listed in Atlassian's Security Bulletin of September 15 2026.
Text from the source record.
- Bitbucket Data Center and Server: 10.4.1
- Bitbucket Data Center and Server: 10.3.0 to 10.3.2
- Bitbucket Data Center and Server: 10.2.0 to 10.2.5 (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 9.4.23 (LTS)
- Bitbucket Data Center and Server: 9.3.0 to 9.3.2
- Bitbucket Data Center and Server: 9.2.0 to 9.2.1
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-42583
Upgrade to a fixed release named by Atlassian:
- Bitbucket Data Center and Server: 10.4.2 to 10.4.3 Data Center Only
- Bitbucket Data Center and Server: 10.2.6 to 10.2.7 (LTS) recommended Data Center Only
- Bitbucket Data Center and Server: 9.4.24 (LTS) Data Center Only
Vendor guidance
- Upgrade to a fixed version listed by Atlassian: Bitbucket Data Center and Server: 10.4.2 to 10.4.3 Data Center Only; Bitbucket Data Center and Server: 10.2.6 to 10.2.7 (LTS) recommended Data Center Only; Bitbucket Data Center and Server: 9.4.24 (LTS) Data Center Only.
CVE-2026-42583 in other vendors' advisories
- NetApp: NTAP-20260917-0001
- NetApp: NTAP-20260626-0019
- Red Hat: CVE-2026-42583, high severity, fixed in RHSA-2026:34608
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Atlassian advisories, September 2026All Atlassian advisories
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