OCPBUGS-92924: CVE-2026-46597 openshift4/ose-hypershift-rhel9: golang.org/x/crypto/ssh: Denial of Service via crafted AES-GCM packet decoder inputs [openshift-4.19]

[tonyxrmdavidson]

Remediates CVE-2026-46597 (GHSA-q4h4-gmj2-qvw2, CVSS 7.5 High) — integer underflow in the AES-GCM packet decoder in
golang.org/x/crypto/ssh allowing remote DoS via crafted SSH packet.

• Branch: OCPBUGS-92924-CVE-2026-46597-4-19
• Base: release-4.19 (5134322)
• Jira: OCPBUGS-92924

Remediation Approach

Uses the OpenShift sustaining team's security-patched fork via replace directive to maintain compatibility with the release-4.19
dependency tree:

replace golang.org/x/crypto => github.com/openshift-sustaining/crypto v0.24.0-sec.2

Changes

• go.mod — added replace directive for golang.org/x/crypto
• go.sum — updated checksums for the fork
• vendor/golang.org/x/crypto/ — vendored fork replaces upstream (ssh, poly1305, bcrypt, etc.)
• vendor/modules.txt — updated module metadata
• Changes are limited to golang.org/x/crypto vendored files only. No other dependencies were modified.

Build Results — PASS

All 6 binaries built successfully:

• hypershift-operator — PASS
• control-plane-operator — PASS
• control-plane-pki-operator — PASS
• karpenter-operator — PASS
• hypershift (CLI) — PASS
• hcp (product-cli) — PASS

Test Results — PASS

• 133 test packages executed with race detection (-race)
• 0 failures
• All packages passed

Notes

• The direct upgrade path (go get golang.org/x/crypto@v0.52.0) was not used for release-4.19 because it pulls in transitive dependency
  upgrades (x/net, x/sys, x/mod, x/term, x/text, x/tools) that may introduce compatibility risks on this stable branch.
• The sustaining fork (github.com/openshift-sustaining/crypto@v0.24.0-sec.2) backports the security fix to a version compatible with
  release-4.19's dependency tree.

[openshift-merge-bot]

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[openshift-ci-robot]

@tonyxrmdavidson: This pull request references Jira Issue OCPBUGS-92924, which is invalid:

• expected dependent Jira Issue OCPBUGS-92954 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is ASSIGNED instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

Remediates CVE-2026-46597 (GHSA-q4h4-gmj2-qvw2, CVSS 7.5 High) — integer underflow in the AES-GCM packet decoder in
golang.org/x/crypto/ssh allowing remote DoS via crafted SSH packet.

• Branch: OCPBUGS-92924-CVE-2026-46597-4-19
• Base: release-4.19 (5134322)
• Jira: OCPBUGS-92924

Remediation Approach

Uses the OpenShift sustaining team's security-patched fork via replace directive to maintain compatibility with the release-4.19
dependency tree:

replace golang.org/x/crypto => github.com/openshift-sustaining/crypto v0.24.0-sec.2

Changes

• go.mod — added replace directive for golang.org/x/crypto
• go.sum — updated checksums for the fork
• vendor/golang.org/x/crypto/ — vendored fork replaces upstream (ssh, poly1305, bcrypt, etc.)
• vendor/modules.txt — updated module metadata
• Changes are limited to golang.org/x/crypto vendored files only. No other dependencies were modified.

Build Results — PASS

All 6 binaries built successfully:

• hypershift-operator — PASS
• control-plane-operator — PASS
• control-plane-pki-operator — PASS
• karpenter-operator — PASS
• hypershift (CLI) — PASS
• hcp (product-cli) — PASS

Test Results — PASS

• 133 test packages executed with race detection (-race)
• 0 failures
• All packages passed

Notes

• The direct upgrade path (go get golang.org/x/crypto@v0.52.0) was not used for release-4.19 because it pulls in transitive dependency
  upgrades (x/net, x/sys, x/mod, x/term, x/text, x/tools) that may introduce compatibility risks on this stable branch.
• The sustaining fork (github.com/openshift-sustaining/crypto@v0.24.0-sec.2) backports the security fix to a version compatible with
  release-4.19's dependency tree.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tonyxrmdavidson
Once this PR has been reviewed and has the lgtm label, please assign jparrill for approval. For more information see the Code Review Process.

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[tonyxrmdavidson]

/test e2e-aws-techpreview

[tonyxrmdavidson]

/test e2e-conformance

[tonyxrmdavidson]

/pipeline required

[openshift-merge-bot]

Scheduling required tests:
/test e2e-aws-techpreview
/test e2e-conformance

[openshift-ci]

@tonyxrmdavidson: all tests passed!

Full PR test history. Your PR dashboard.

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