This update for python-tornado6 fixes the following issues:
CVE-2026-82397: an unauthenticated request body containing millions of separator-delimited fields can synchronously
stall the single-threaded event loop and delay every connection (bsc#1277725).
CVE-2026-91990: splitting of multipart data before validation of the max_parts limit allows for resource exhaustion
and a denial of service (bsc#1281439).
CVE-2026-91991: incomplete fix for cookie attribute injection allows for cookie validation bypass via semicolon-
delimited data in capitalized parameters (bsc#1281440).