OCPBUGS-100511: Bump postcss to fix CVE-2026-45623

[prabhapa]

CVE-2026-45623: PostCSS Information Disclosure and DoS

Bumps postcss to remediate CVE-2026-45623 (CVSS 7.5 Moderate).

PostCSS versions ≤8.5.11 parse sourceMappingURL comments and dereference paths against the local filesystem without validation, enabling file-read disclosure and DoS. Fixed in postcss ≥8.5.12.

Changes

• postcss: 8.4.31 → 8.5.26 (via resolutions in frontend/package.json)
• Resolution range updated from ^8.2.13 to ^8.5.12
• Lockfile (frontend/yarn.lock) regenerated

Sub-dependency updates (automatic via lockfile):

• nanoid 3.3.6 → 3.3.18
• picocolors 1.0.0 → 1.1.1
• source-map-js 1.0.2 → 1.2.1

Validation

• Clean yarn install
• postcss functional verification (processes CSS correctly at 8.5.26)
• All postcss consumers resolve to 8.5.26
• Unit tests pass (jest 2/2)
• Lint clean (eslint)

References

• Jira: https://redhat.atlassian.net/browse/OCPBUGS-100511
• CVE: https://access.redhat.com/security/cve/CVE-2026-45623
• GHSA: GHSA-6g55-p6wh-862q

[openshift-merge-bot]

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[openshift-ci-robot]

@prabhapa: This pull request references Jira Issue OCPBUGS-100511, which is invalid:

• expected dependent Jira Issue OCPBUGS-100512 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:

CVE-2026-45623: PostCSS Information Disclosure and DoS

Bumps postcss to remediate CVE-2026-45623 (CVSS 7.5 Moderate).

PostCSS versions ≤8.5.11 parse sourceMappingURL comments and dereference paths against the local filesystem without validation, enabling file-read disclosure and DoS. Fixed in postcss ≥8.5.12.

Changes

• postcss: 8.4.31 → 8.5.26 (via resolutions in frontend/package.json)
• Resolution range updated from ^8.2.13 to ^8.5.12
• Lockfile (frontend/yarn.lock) regenerated

Sub-dependency updates (automatic via lockfile):

• nanoid 3.3.6 → 3.3.18
• picocolors 1.0.0 → 1.1.1
• source-map-js 1.0.2 → 1.2.1

Validation

• Clean yarn install
• postcss functional verification (processes CSS correctly at 8.5.26)
• All postcss consumers resolve to 8.5.26
• Unit tests pass (jest 2/2)
• Lint clean (eslint)

References

• Jira: https://redhat.atlassian.net/browse/OCPBUGS-100511
• CVE: https://access.redhat.com/security/cve/CVE-2026-45623
• GHSA: GHSA-6g55-p6wh-862q

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[germanparente]

/lgtm

[openshift-merge-bot]

Scheduling required tests:
/test e2e-gcp-console

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: germanparente, prabhapa
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Details

Needs approval from an approver in each of these files:

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[prabhapa]

/test e2e-gcp-console

[openshift-ci]

@prabhapa: all tests passed!

Full PR test history. Your PR dashboard.

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[prabhapa]

/label backport-risk-assessed