HIGH

CVE-2026-56862

CVSS v3

7.5

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-10-17

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

golangBitnamiall versions · fixed in 1.25.13
stdlibGoall versions · fixed in 1.25.13
aardvark-dnsAlmaLinux:8all versions · fixed in 2:1.10.1-2.module_el8.10.0+3901+4b80ecd7
buildahAlmaLinux:10all versions · fixed in 2:1.43.1-6.el10_2and 1 other package
buildahAlmaLinux:9all versions · fixed in 2:1.43.3-2.el9_8and 1 other package
buildahAlmaLinux:8all versions · fixed in 2:1.33.14-6.module_el8.10.0+4269+94686149and 1 other package
cockpit-podmanAlmaLinux:8all versions · fixed in 84.1-1.module_el8.10.0+4102+6c76e544
conmonAlmaLinux:8all versions · fixed in 3:2.1.10-1.module_el8.10.0+3845+87b84552

47 more package ranges on OSV.dev

Vendor advisories

CVE-2026-56862 Red Hat Product Security8,060 products fixed · 280 known affected
crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages
rhai/assisted-installer-rhel9 as a component of Assisted Installer for Red Hat OpenShift Container Platform 2 · albo/aws-load-balancer-operator as a component of AWS Load Balancer Operator · compliance/openshift-compliance-rhel8-operator as a component of Compliance Operator
RHSA-2026:73864 Red Hat Product Security5 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.14.75 packages and security update
RHSA-2026:74797 Red Hat Product Security24 products fixed
Red Hat Security Advisory: Red Hat build of MicroShift 4.20.41 security update
RHSA-2026:73869 Red Hat Product Security628 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.14.75 bug fix and security update
RHSA-2026:77899 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Web Terminal Operator 1.11.2 release.
RHSA-2026:77273 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat OpenShift GitOps v1.20.8 security update

184 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-08-13
Last Modified: 2026-08-14

Frequently asked questions

What is CVE-2026-56862?

Is CVE-2026-56862 actively exploited?

Active exploitation of CVE-2026-56862 has not been confirmed. Its EPSS score was 0.6% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-56862?

CVE-2026-56862 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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