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Highest advisory severityHigh 1 vendor · 1 advisory

CVE-2026-55831

CVE-2026-55831: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-55831] Denial of Service via SPDY SETTINGS frame processing

    CVE-2026-55831Source published Source updated

    Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, Netty's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in `DefaultSpdySettingsFrame`, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. A remote attacker, by sending a specially crafted SPDY/3.1 SETTINGS frame, could cause the SPDY SETTINGS decoder to create a large number of map entries. This excessive processing and memory allocation can lead to a denial of service (DoS) due to heap growth and increased CPU usage.…

    Affected products in this advisory
    • Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16
    • Red Hat Build of Apache Camel 4.18 for Quarkus 3.33
    • Red Hat build of Quarkus 3.27.4.SP3
    • Red Hat build of Quarkus 3.33.2.SP3

    18 more entries in the full advisory.

    Source-reported affected versions
    • < 4.1.136.Final
    • < 4.2.16.Final
    • < 3.1
    Source-reported fixed versions
    • 4.1.136
    • 4.2.16
    • netty-codec-http
    • devspaces/openvsx-rhel9:1787759145

    7 more entries in the full advisory.

    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

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