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Highest advisory severityHigh 1 vendor · 1 advisory

CVE-2026-56862

CVE-2026-56862: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.

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-2026-56862] Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages

    CVE-2026-56862Source published Source updated

    Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely. A flaw was found in the `crypto/tls` package, part of `golang`. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10.0 Extended Update Support
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
    • Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

    52 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • golang-0:1.26.7-1.el10_2
    • go-fdo-client-0:1.0.0-4.el10_2.7
    • go-fdo-server-0:1.0.1-2.el10_2.4
    • golang-github-openprinting-ipp-usb-0:0.9.27-7.el10_2.3

    46 more entries in the full advisory.

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

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