OCPBUGS-92954: CVE-2026-46597 openshift4/ose-hypershift-rhel9: golan.org/x/crypto/ssh: Denial of Service via crafted AES-GCM packet decoder inputs [openshift-4.20]

[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-92954-CVE-2026-46597-4-20
• Base: release-4.20 (09b4108)
• Jira: OCPBUGS-92954

Remediation Approach

Uses the OpenShift sustaining team's security-patched fork via replace directive to maintain compatibility with the release-4.20
dependency tree:

replace golang.org/x/crypto => github.com/openshift-sustaining/crypto v0.33.0-sec.3

Changes

• 27 files changed, 340 insertions(+), 834 deletions(-)
• 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

• 119 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-4.20 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@v0.33.0-sec.3) backports the security fix to a version compatible with
  release-4.20's dependency tree.

[openshift-merge-bot]

Pipeline controller notification
This repo is configured to use the pipeline controller. Second-stage tests will be triggered either automatically or after lgtm label is added, depending on the repository configuration. The pipeline controller will automatically detect which contexts are required and will utilize /test Prow commands to trigger the second stage.

For optional jobs, comment /test ? to see a list of all defined jobs. To trigger manually all jobs from second stage use /pipeline required command.

This repository is configured in: LGTM mode

[openshift-ci-robot]

@tonyxrmdavidson: This pull request references Jira Issue OCPBUGS-92954, which is invalid:

• expected dependent Jira Issue OCPBUGS-93030 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-92954-CVE-2026-46597-4-20
• Base: release-4.20 (09b4108)
• Jira: OCPBUGS-92954

Remediation Approach

Uses the OpenShift sustaining team's security-patched fork via replace directive to maintain compatibility with the release-4.20
dependency tree:

replace golang.org/x/crypto => github.com/openshift-sustaining/crypto v0.33.0-sec.3

Changes

• 27 files changed, 340 insertions(+), 834 deletions(-)
• 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

• 119 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-4.20 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@v0.33.0-sec.3) backports the security fix to a version compatible with
  release-4.20's dependency tree.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

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[openshift-ci]

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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 csrwng for approval. For more information see the Code Review Process.

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[rtheis]

/uncc @rtheis

[tonyxrmdavidson]

/retest

[tonyxrmdavidson]

/retest

[tonyxrmdavidson]

/test verify

[tonyxrmdavidson]

/pipeline required

[openshift-merge-bot]

Pipeline controller notification

No second-stage tests were triggered for this PR.

This can happen when:

• The changed files don't match any pipeline_run_if_changed patterns
• All files match pipeline_skip_if_only_changed patterns
• No pipeline-controlled jobs are defined for the release-4.20 branch

Use /test ? to see all available tests.

[tonyxrmdavidson]

/retest

[openshift-ci]

@tonyxrmdavidson: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/verify	56d611b	link	true	/test verify

Full PR test history. Your PR dashboard.

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