Upgrade expat to 2.8.0 for CVE-2026-7210 [Medium]

[BinduSri-6522866]

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

Upgrade expat to 2.8.0 for CVE-2026-7210

• Removed existing patches from spec which are fixed by this upgrade.

Change Log

• modified: ../SPECS/expat/expat.signatures.json
• modified: ../SPECS/expat/expat.spec
• modified: ../cgmanifest.json
• modified: resources/manifests/package/pkggen_core_aarch64.txt
• modified: resources/manifests/package/pkggen_core_x86_64.txt
• modified: resources/manifests/package/toolchain_aarch64.txt
• modified: resources/manifests/package/toolchain_x86_64.txt

Does this affect the toolchain?

YES

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-2026-7210

Test Methodology

• Local Build:

expat-2.8.0-1.azl3.src.rpm.log
expat-2.8.0-1.azl3.src.rpm.test.log

[Kanishk-Bansal]

Buddy Build

[Kanishk-Bansal]

Source Publish - https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1127794&view=results