OCPBUGS-93030: CVE-2026-46597 openshift4/ose-hypershift-rhel9: golang.org/x/crypto/ssh: Denial of Service via crafted AES-GCM packet decoder inputs [openshift-4.21]

[tonyxrmdavidson]

Summary
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-93030-CVE-2026-46597-4-21
Base: release-4.21 (04c25e5)
Jira: OCPBUGS-93030
Remediation Approach
Uses the OpenShift sustaining team's security-patched fork via replace directive to maintain compatibility with the release-4.21 dependency tree:

replace golang.org/x/crypto => github.com/openshift-sustaining/crypto v0.33.0-sec.3
Changes
46 files changed, 6,585 insertions(+), 1,329 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, sha3, 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
136 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-4.21 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-4.21's dependency tree.

[openshift-merge-bot]

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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-93030, which is invalid:

• expected dependent Jira Issue OCPBUGS-95572 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
• expected dependent Jira Issue OCPBUGS-95572 to target a version in 4.22.0, but it targets "4.22.z" 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:

Summary
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-93030-CVE-2026-46597-4-21
Base: release-4.21 (04c25e5)
Jira: OCPBUGS-93030
Remediation Approach
Uses the OpenShift sustaining team's security-patched fork via replace directive to maintain compatibility with the release-4.21 dependency tree:

replace golang.org/x/crypto => github.com/openshift-sustaining/crypto v0.33.0-sec.3
Changes
46 files changed, 6,585 insertions(+), 1,329 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, sha3, 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
136 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-4.21 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-4.21'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]

[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]

/retest-required

[tonyxrmdavidson]

/retest

[openshift-ci]

@tonyxrmdavidson: The following tests 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/e2e-aws	6d94edc	link	true	/test e2e-aws
ci/prow/verify	6d94edc	link	true	/test verify

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