HTTP Request Smuggling io.netty:netty-codec-http Dependency in Jira Software Data Center

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    • Type: Public Security Vulnerability
    • Resolution: Fixed
    • Priority: Highest
    • 9.12.28, 11.3.7, 10.3.22
    • Affects Version/s: 9.12.1, 9.16.0, 9.17.0, 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, 11.3.0, 11.3.1, 11.3.2, 11.3.3, 11.3.4, 11.3.5, 11.3.6
    • Component/s: Security
    • 9.8
    • Critical
    • CVE-2026-42581
    • Atlassian (Internal)
    • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    • Jira Software Data Center

      This is a vulnerability in a non-Atlassian Jira Software dependency. Atlassian's application of this dependency presents a lower, non-critical assessed risk.

      This Critical severity Injection vulnerability was introduced in versions 9.12.1, 9.16.0, 9.17.0, 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 Software Data Center and Jira Software Server.

      This Injection (HTTP Request Smuggling) vulnerability, with a CVSS Score of 9.8 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H allows an unauthenticated attacker to smuggle HTTP requests which has high impact to confidentiality, high impact to integrity, high impact to availability, and requires no user interaction.

      Atlassian recommends that Jira Software Data Center and Jira Software Server customers upgrade to the latest version. If you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

      • Jira Software Data Center and Server 11.3: Upgrade to a release greater than or equal to 11.3.5
      • Jira Software Data Center and Server 10.3: Upgrade to a release greater than or equal to 10.3.22
      • Jira Software Data Center and Server 9.12: Upgrade to a release greater than or equal to 9.12.28

      See the release notes (https://www.atlassian.com/software/jira/download-archives). You can download the latest version of Jira Software Data Center from the download center (https://confluence.atlassian.com/jirasoftware/jira-software-release-notes-776821069.html).

      The National Vulnerability Database provides the following description for this vulnerability: HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in io.netty:netty-codec-http 4.1.133.Final.

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              Unassigned
              Reporter:
              Security Metrics Bot
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                Created:
                Updated:
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