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Type:
Public Security Vulnerability
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Resolution: Fixed
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Priority:
High
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Affects Version/s: 5.9.0, 5.10.0, 5.11.0, 5.12.0, 5.13.0, 5.14.0, 5.15.2, 5.16.0, 5.16.1, 5.17.0, 5.17.1, 5.17.2, 5.17.3, 5.17.4, 5.17.5, 10.0.0, 10.0.1, 10.1.1, 10.1.2, 10.2.0, 10.2.1, 10.3.0, 10.3.1, 10.3.2, 10.3.3, 10.3.4, 10.3.5, 10.3.6, 10.3.7, 10.3.8, 10.3.9, 10.3.10, 10.3.11, 10.3.12, 10.3.13, 10.3.14, 10.3.15, 10.4.0, 10.4.1, 10.5.0, 10.5.1, 10.6.0, 10.6.1, 10.7.1, 10.7.2, 10.7.3, 10.7.4, 11.0.0, 11.1.0, 11.0.1, 11.1.1, 11.2.0, 11.2.1, 11.3.0, 11.3.1, 11.3.2, 11.3.3, 11.3.4, 11.3.5, 11.3.6, 11.3.7, 11.3.8, 11.3.9, 11.3.10, 10.3.16, 10.3.17, 10.3.18, 10.3.19, 10.3.20, 10.3.21, 10.3.22, 10.3.23, 10.3.24
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Component/s: None
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8.7
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High
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CVE-2026-75596
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Atlassian (Internal)
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CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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DoS (Denial of Service)
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Jira Service Management Data Center
This High severity DoS (Denial of Service) vulnerability was introduced in versions 5.15.2, 5.16.0, 5.17.0, 10.0.0,
10.1.1, 10.2.0, 10.3.0, 10.4.0, 10.5.0, 10.6.0, 10.7.1, 11.0.0, 11.1.0, 11.2.0, and 11.3.0 of Jira Service Management
Data Center.
This DoS (Denial of Service) vulnerability, with a CVSS Score of 8.7 and a CVSS Vector of
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N, allows an unauthenticated attacker to expose assets in
your environment susceptible to exploitation which has no impact to confidentiality, no impact to integrity, high impact
to availability, and requires no user interaction.
Atlassian recommends that Jira Service Management Data Center customers upgrade to latest version, if you are unable to do so, upgrade
your instance to one of the specified supported fixed versions:
- Jira Service Management Data Center 11.3: Upgrade to a release greater than or equal to 11.3.11
- Jira Service Management Data Center 10.3: Upgrade to a release greater than or equal to 10.3.25
See the release notes (https://confluence.atlassian.com/servicemanagement/jira-service-management-release-notes-780083086.html). You can download the latest version of Jira Service Management Data Center from the download center (https://www.atlassian.com/software/jira/service-management/download-archives).
The National Vulnerability Database provides the following description for this vulnerability:
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the
default io.netty.handler.ssl.SniHandler constructors use the pre-handshake ClientHello aggregation path in
handler/src/main/java/io/netty/handler/ssl/SslClientHelloHandler.java at
io.netty.handler.ssl.SslClientHelloHandler#decode, where handshakeBuffer.clear() and writeBytes() recopy all previously
received body bytes for every additional TLS record. An unauthenticated remote peer can advertise a large ClientHello
and deliver its body in thousands of tiny records, causing quadratic CPU work on the event loop before the TLS handshake
completes and degrading TLS handling for other clients. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.