* Revert fixes for CVE-2025-15366 and CVE-2025-15367. It was found that
those changes break backward compatibility, and upstream didn't backport
it to any branch. More details can be found in discussions on the upstream
bugtracker (issues and merge requests).
* Apply upstream patch for the following CVE:
- CVE-2026-6100: Use-after-free (UAF) was possible in the
`lzma.LZMADecompressor` and `bz2.BZ2Decompressor` when a memory
allocation fails with a `MemoryError` and the decompression instance is
re-used. This scenario can be triggered if the process is under memory
pressure.