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High 2 vendors · 2 advisories

CVE-2026-59901: DoS (Denial of Service) Netty Dependency in Confluence Data Center

CVE-2026-59901 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
High
CVSS base score
8.7 (Atlassian), 7.5 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (Red Hat)
Weakness
CWE-835
Fixed releases
  • Atlassian: 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
  • Red Hat: 4.1.136, 4.2.16, netty-codec-compression, devspaces/multicluster-redirector-rhel9:1792491532, RHSA-2026:69296, RHSA-2026:54435 and 1 more in the advisory
Vendor advisories
2 from Atlassian, Red Hat
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-59901; each belongs to its advisory, not to every product listed. How records are collected and checked.

How do I fix CVE-2026-59901?

Upgrade to a fixed release named by the vendor:

  • Atlassian: 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
  • Red Hat: 4.1.136, 4.2.16, netty-codec-compression, devspaces/multicluster-redirector-rhel9:1792491532, RHSA-2026:69296, RHSA-2026:54435
  • Upgrade to a fixed version listed by Atlassian: 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. (Atlassian)

Vendor advisories for CVE-2026-59901

Atlassian

1 advisory
  • Advisory severityHigh8.7

    High [CVE-2026-59901] DoS (Denial of Service) Netty Dependency in Confluence Data Center

    CVE-2026-59901Source published

    DoS (Denial of Service) Netty Dependency in Confluence Data Center. Affected: Confluence Data Center and Server. Listed in Atlassian's Security Bulletin of September 15 2026.

    Affected products in this advisory
    • Confluence Data Center and Server
    Source-reported affected versions
    • 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

    7 more entries in the full advisory.

    Source-reported fixed versions
    • 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
    Mitigation guidance
    • Upgrade to a fixed version listed by Atlassian: 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.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-59901] Infinite loop in netty-codec-compression (bzip2)

    CVE-2026-59901Source published Source updated

    Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the `Bzip2Decoder` handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop. The vulnerability exists in the run-length encoding (RLE) state machine within [`Bzip2BlockDecompressor.read()`]. This vulnerability, caused by a logic error in the bzip2 decoder, allows a remote attacker to send specially crafted bzip2-compressed data. Processing this malformed data can trigger an infinite loop, causing the decoder thread to consume excessive CPU resources. This leads to a denial of service (DoS), requiring manual intervention to restore…

    Affected products in this advisory
    • Red Hat Data Grid 8.6.3
    • Streams for Apache Kafka 3.2.1
    • Red Hat OpenShift Dev Spaces 3.31
    • Red Hat build of Apache Camel - HawtIO 4
    Source-reported affected versions
    • < 4.1.136.Final
    • < 4.2.16.Final
    Source-reported fixed versions
    • 4.1.136
    • 4.2.16
    • netty-codec-compression
    • devspaces/multicluster-redirector-rhel9:1792491532

    3 more entries in the full advisory.

    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

References

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