OCPBUGS-101787: Bump postcss to fix CVE-2026-69153

[prabhapa]

CVE-2026-69153: PostCSS Information Disclosure

Bumps postcss from 8.4.31 to 8.5.19 to fix CVE-2026-69153.

Vulnerability

PostCSS prior to 8.5.19 allows an attacker to cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL when from is unset. The resulting map's sources and sourcesContent may then be exposed to the application.

• CVSS v3: 7.5 (Important)
• CWE: CWE-22 (Path Traversal)
• Fix: postcss 8.5.19
• Advisory: GHSA-fxqj-rqcc-2cmp

Changes

• frontend/package.json: Updated resolutions entry for postcss from ^8.2.13 to 8.5.19
• frontend/yarn.lock: Regenerated — postcss 8.4.31→8.5.19 plus transitive updates (nanoid→3.3.18, source-map-js→1.2.1)

Validation

• yarn install --immutable passes (lockfile integrity — same gate CI enforces)
• Runtime resolution confirms single copy of postcss@8.5.19

Jira

• OCPBUGS-101787

[openshift-merge-bot]

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[openshift-ci-robot]

@prabhapa: This pull request references Jira Issue OCPBUGS-101787, which is invalid:

• expected dependent Jira Issue OCPBUGS-101788 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-2026-69153: PostCSS Information Disclosure

Bumps postcss from 8.4.31 to 8.5.19 to fix CVE-2026-69153.

Vulnerability

PostCSS prior to 8.5.19 allows an attacker to cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL when from is unset. The resulting map's sources and sourcesContent may then be exposed to the application.

• CVSS v3: 7.5 (Important)
• CWE: CWE-22 (Path Traversal)
• Fix: postcss 8.5.19
• Advisory: GHSA-fxqj-rqcc-2cmp

Changes

• frontend/package.json: Updated resolutions entry for postcss from ^8.2.13 to 8.5.19
• frontend/yarn.lock: Regenerated — postcss 8.4.31→8.5.19 plus transitive updates (nanoid→3.3.18, source-map-js→1.2.1)

Validation

• yarn install --immutable passes (lockfile integrity — same gate CI enforces)
• Runtime resolution confirms single copy of postcss@8.5.19

Jira

• OCPBUGS-101787

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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Details

Needs approval from an approver in each of these files:

• frontend/OWNERS

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[openshift-ci]

@prabhapa: 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/backend	8c27135	link	true	/test backend

Full PR test history. Your PR dashboard.

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