CVE-2026-44249: Atlassian Improper Authorization io.netty:netty-handler Dependency in Bitbucket Data Center
This Atlassian advisory covers CVE-2026-44249 in Bitbucket Data Center and Server and Confluence Data Center and Server.
Key facts
- Vendor rating
- High, CVSS 8.1
- 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 13 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 and 2 more below
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Improper Authorization io.netty:netty-handler Dependency in Bitbucket Data Center. Affected: Bitbucket Data Center and Server, Confluence 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
- Confluence Data Center and Server: 10.2.0 to 10.2.15 (LTS)
- Confluence Data Center and Server: 10.1.0 to 10.1.2
- Confluence Data Center and Server: 10.0.2 to 10.0.3
- Confluence Data Center and Server: 9.5.1 to 9.5.4
- Confluence Data Center and Server: 9.4.0 to 9.4.1
- Confluence Data Center and Server: 9.3.1 to 9.3.2
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-44249
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
- Confluence Data Center and Server: 10.2.17 to 10.2.18 (LTS) recommended Data Center Only
- Confluence Data Center and Server: 9.2.24 to 9.2.25 (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; Confluence Data Center and Server: 10.2.17 to 10.2.18 (LTS) recommended Data Center Only.
Support dates for the fixed release lines
- Atlassian Confluence 10.2: support ends
- Atlassian Confluence 9.4: support ends
- Atlassian Confluence 9.2: support ends
CVE-2026-44249 in other vendors' advisories
- NetApp: NTAP-20260626-0020
- NetApp: NTAP-20260917-0005
- Red Hat: CVE-2026-44249, high severity, fixed in RHSA-2026:26586
More Atlassian advisories
CVE-2026-73508Oct 20, 2026DoS (Denial of Service) io.netty:netty-codec-dns Dependency in Bitbucket Data CenterCVE-2026-59645Oct 20, 2026DoS (Denial of Service) org.bouncycastle:bcutil-jdk18on Dependency in Bamboo Data CenterCVE-2026-75140Oct 20, 2026DoS (Denial of Service) org.jsoup:jsoup Dependency in Bamboo Data CenterCVE-2026-73507Oct 20, 2026DoS (Denial of Service) io.netty:netty-codec Dependency in Bitbucket Data CenterCVE-2026-56745Oct 20, 2026DoS (Denial of Service) io.netty:netty-codec-http Dependency in Bitbucket Data CenterCVE-2026-55833Oct 20, 2026DoS (Denial of Service) io.netty:netty-codec-http Dependency in Bitbucket Data Center
Atlassian advisories, September 2026All Atlassian advisories
Get an email when Atlassian Confluence publishes the next one.
See Atlassian Confluence's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
iPhone and Android apps · New on the App Store
Monitor future Atlassian CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
