OCPBUGS-103481: CVE-2026-33814-4-18 openshift4/ose-monitoring-plugin-rhel9: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame [openshift-4.18]

[tonyxrmdavidson]

golang.org/x/net's HTTP/2 implementation is vulnerable to a denial-of-service attack (CVE-2026-33814). A malicious or malformed peer can send an HTTP/2 SETTINGS frame with an invalid/out-of-range SETTINGS_MAX_FRAME_SIZE value. The affected code fails to properly validate this setting before using it to size internal buffers/frame handling, allowing a remote peer to trigger excessive resource consumption or a crash in the server, resulting in denial of service.

Fix: added a replace directive in go.mod (replace golang.org/x/net => github.com/openshift-sustaining/net v0.50.0-sec.4) swapping upstream golang.org/x/net for a patched fork that backports the upstream fix for CVE-2026-33814. The require block still lists the pre-replace golang.org/x/net version as indirect; this is expected, as replace unconditionally overrides that at build time (confirmed via go list -m golang.org/x/net, which resolves to the patched fork). go.sum updated with corresponding checksums.

Testing: make build-backend builds successfully against the patched module; go test ./pkg/... -v passes all tests (no test-backend Makefile target on this branch).

Backend-only change (Go module dependency), no application code modified. Target branch: release-4.18.

[openshift-merge-bot]

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[openshift-ci-robot]

@tonyxrmdavidson: This pull request references Jira Issue OCPBUGS-103481, which is invalid:

• expected dependent Jira Issue OCPBUGS-103703 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is New 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:

golang.org/x/net's HTTP/2 implementation is vulnerable to a denial-of-service attack (CVE-2026-33814). A malicious or malformed peer can send an HTTP/2 SETTINGS frame with an invalid/out-of-range SETTINGS_MAX_FRAME_SIZE value. The affected code fails to properly validate this setting before using it to size internal buffers/frame handling, allowing a remote peer to trigger excessive resource consumption or a crash in the server, resulting in denial of service.

Fix: added a replace directive in go.mod (replace golang.org/x/net => github.com/openshift-sustaining/net v0.50.0-sec.4) swapping upstream golang.org/x/net for a patched fork that backports the upstream fix for CVE-2026-33814. The require block still lists the pre-replace golang.org/x/net version as indirect; this is expected, as replace unconditionally overrides that at build time (confirmed via go list -m golang.org/x/net, which resolves to the patched fork). go.sum updated with corresponding checksums.

Testing: make build-backend builds successfully against the patched module; go test ./pkg/... -v passes all tests (no test-backend Makefile target on this branch).

Backend-only change (Go module dependency), no application code modified. Target branch: release-4.18.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tonyxrmdavidson
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@tonyxrmdavidson: all tests passed!

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[jgbernalp]

/hold