DoS (Denial of Service) io.netty:netty-codec-http Dependency in Confluence Data Center and Server

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    • Type: Public Security Vulnerability
    • Resolution: Fixed
    • Priority: High
    • 9.2.21, 10.2.13
    • Affects Version/s: 7.0.1, 7.4.0, 7.13.0, 7.19.0, 8.5.0, 8.9.0, 8.9.1, 8.9.2, 8.9.3, 8.9.4, 9.1.0, 9.0.1, 8.9.5, 9.0.2, 9.0.3, 8.9.6, 8.9.7, 9.1.1, 8.9.8, 9.2.0, 9.2.1, 9.4.0, 9.3.1, 9.2.2, 9.3.2, 9.2.3, 9.4.1, 9.2.4, 9.2.5, 9.2.6, 9.5.1, 9.5.2, 9.5.3, 9.2.7, 10.1.0, 9.2.8, 10.0.2, 10.0.3, 9.5.4, 9.2.9, 10.1.1, 10.2.0, 9.2.10, 10.1.2, 9.2.11, 9.2.12, 10.2.1, 9.2.13, 10.2.2, 9.2.14, 10.2.3, 9.2.15, 10.2.6, 9.2.17, 10.2.7, 9.2.19, 10.2.10, 10.2.11, 9.2.20
    • Component/s: None
    • None
    • 7.5
    • High
    • CVE-2026-42587
    • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    • DoS (Denial of Service)
    • Confluence Data Center

      This High severity DoS (Denial of Service) vulnerability was introduced in versions 7.0.1, 7.4.0, 7.13.0, 7.19.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.1, and 10.2.0 of Confluence Data Center.

      This DoS (Denial of Service) vulnerability, with a CVSS Score of 7.5 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H allows an unauthenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network which has no impact to confidentiality, no impact to integrity, high impact to availability, and requires no user interaction.

      Atlassian recommends that Confluence 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:

      • Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.13
      • Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.21

      See the release notes (https://confluence.atlassian.com/doc/confluence-release-notes-327.html). You can download the latest version of Confluence Data Center from the download center (https://www.atlassian.com/software/confluence/download-archives).

      The National Vulnerability Database provides the following description for this vulnerability: Netty is an asynchronous,
      event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a
      maxAllocation parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is
      correctly enforced for gzip and deflate encodings via ZlibDecoder, but is silently ignored when the content encoding is
      br (Brotli), zstd, or snappy. An attacker can bypass the configured decompression limit by sending a compressed payload
      with Content-Encoding: br instead of Content-Encoding: gzip, causing unbounded memory allocation and out-of-memory
      denial of service. The same vulnerability exists in DelegatingDecompressorFrameListener for HTTP/2 connections. This
      vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

              Assignee:
              Unassigned
              Reporter:
              David Detweiler
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                Created:
                Updated:
                Resolved: