Medium [CVE-2026-78662] Denial of Service via channel request flooding
This medium-severity Red Hat Linux advisory covers CVE-2026-78662 affecting Assisted Installer for Red Hat OpenShift Container Platform 2, Builds for Red Hat OpenShift, cert-manager Operator for Red Hat OpenShift.
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Summary
A flaw was found in golang.org/x/crypto/ssh. A malicious remote attacker could flood a channel's incoming requests before it is established, leading to a deadlock of the entire connection.
This could result in a denial of service (DoS) for legitimate users. A malicious SSH peer can flood a channel with crafted requests before the channel is fully established, causing the affected SSH connection to become unresponsive.
This vulnerability does not affect confidentiality or integrity. Red Hat rates this issue as Moderate because the demonstrated availability impact is limited to the affected connection.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-833.
Affected products named by the advisory: Assisted Installer for Red Hat OpenShift Container Platform 2; Builds for Red Hat OpenShift; cert-manager Operator for Red Hat OpenShift; Confidential Compute Attestation; and 34 more.
Affected products named by the advisory: Cryostat 4; External Secrets Operator for Red Hat OpenShift; Multicluster Engine for Kubernetes; OpenShift API for Data Protection; and 30 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Red Hat is not aware of a practical mitigation that fully prevents this issue while maintaining affected SSH functionality. Where operationally possible, restrict SSH connectivity to trusted systems. Apply relevant Red Hat updates when they become available.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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