[AutoPR- Security] Patch fluent-bit for CVE-2026-58055 [MEDIUM]

[Azure Linux Security Servicing Account (azurelinux-security)]

Auto Patch fluent-bit for CVE-2026-58055.

Autosec pipeline run -> https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1150963&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 fluent-bit for CVE-2026-58055 (MEDIUM).

Change Log

• CVE-2026-58055

Does this affect the toolchain?

YES/NO

Associated issues

• N/A

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-2026-58055

Test Methodology

• Pipeline build id: Buddy Build URL

[BinduSri-6522866]

Patch is backported manually to support the existing codebase.

• src/shrpx_http2_upstream.cc and src/shrpx_http3_upstream.cc: Backport follows branch’s existing callback pattern (error_reply check + mapped return), not upstream one-line style [return error_reply(downstream, 400);].
  Buddy Build - https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1151560&view=results
  Build passed.

[Kanishk Bansal (Kanishk-Bansal)]

please check are we even shipping nghttpx

as acc to me

Top-level CMakeLists.txt sets ENABLE_LIB_ONLY ON

lib/nghttp2/CMakeLists.txt: ENABLE_LIB_ONLY ⇒ ENABLE_APP OFF

lib/nghttp2/src/CMakeLists.txt: all shrpx_* sources are gated behind if(ENABLE_APP)

➡️ The patched files are never compiled into fluent-bit. This is a functional no-op — fluent-bit is effectively not affected.

[BinduSri-6522866]

As per ldd output, it shows /usr/bin/fluent-bit is dynamically linked to the system library libnghttp2.so.14 at /usr/lib/libnghttp2.so.14.

During build/runtime, it is not statically using nghttp2 code for linkage path. It might be dynamically links to system libnghttp and not the nghttp2 in fluent-bit package.

[Kanishk Bansal (Kanishk-Bansal)]

disputed hence cllosing