[AutoPR- Security] Patch libxml2 for CVE-2026-0990, CVE-2026-0992 [MEDIUM]

[azurelinux-security]

Auto Patch libxml2 for CVE-2026-0990, CVE-2026-0992.

Autosec pipeline run -> https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1029832&view=results

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

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Summary

What does the PR accomplish, why was it needed?

• Auto Patch libxml2 for CVE-2026-0990 (MEDIUM), CVE-2026-0992 (LOW).

Change Log

• CVE-2026-0990
• CVE-2026-0992

Does this affect the toolchain?

YES/NO

Associated issues

• N/A

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-2026-0990
• https://nvd.nist.gov/vuln/detail/CVE-2026-0992

Test Methodology

• Pipeline build id: Buddy Build URL

[akhila-guruju]

Backported for CVE-2026-0992 to fix build
func xmlCatalogPrintDebug() definition has been added in catalog.c file which was used in the CVE fix and xmlVPrintErrorMessage() func definition added in error.c which is used inside xmlCatalogPrintDebug() func.

xmlCatalogPrintDebug() - https://gitlab.gnome.org/GNOME/libxml2/-/blob/master/catalog.c?ref_type=heads#L237
xmlVPrintErrorMessage() - https://gitlab.gnome.org/GNOME/libxml2/-/blob/master/error.c?ref_type=heads#L1345

[Kanishk-Bansal]

Buddy Build

[akhila-guruju]

Buddy Build has passed.

[suresh-thelkar]

After fixing the suggest code change, please do verify the following.

• Buddy and Full Build to ensure patches apply cleanly after header fix

• Run package tests (%check section) to verify functionality

• Validate the ptests

[suresh-thelkar]

There is letter 'F' missing (It should be From) in this line of code.

[akhila-guruju]

Corrected.

[Kanishk-Bansal]

Build

[suresh-thelkar]

The recent changes look good to me. I have also run the full build - https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1044435&view=results

Also make sure that all the things mentioned here should go fine before mering the PR.

[Kanishk-Bansal]

Full Build after rebase