Security update for go1.26

Open Source Vulnerabilities SUSE-SU-2026:3641-1

This update for go1.26 fixes the following issues: Security issues fixed: - CVE-2026-33818: encoding/asn1: enforce maximum recursion depth (bsc#1275034). - CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation bypass and privilege escalation (bsc#1266609). - CVE-2026-56853: net/http: apply ReadHeaderTimeout when doing unencrypted HTTP/2 check (bsc#1275028). - CVE-2026-56858: html/template: fix Javascript regexp context tracking (bsc#1275033). - CVE-2026-56859: encoding/xml: add recursion depth guard during decode (bsc#1275026). - CVE-2026-56860: net/url: avoid quadratic complexity in resolvePath (bsc#1275029). - CVE-2026-56862: crypto/tls: limit handshake messages we are willing to accept post-handshake (bsc#1275032). - CVE-2026-56864: x/mod/sumdb: ignore unrelated, unauthenticated hashes in Lookup (bsc#1275025). - CVE-2026-56865: x/mod/sumdb/tlog: fix transparency log tile verification bypass (bsc#1275024). Non security issue fixed: - go1.26 release tracking (bsc#1255111). Changes for go1.26: - update to go1.26.6 * go#79876 cmd/compile: prove misscompilation in slicemask folding leaves garbage in the upper bits * go#80099 cmd/compile: internal compiler error invalid heap allocated var without Heapaddr * go#80131 cmd/link: peCreateExportFile generates invalid .def file when output name has trailing dot (c-shared on Windows) * go#80365 os: Root's MkdirAll can't create paths ending in forward slashes * go#80367 os: TestRootMultiReadFile fails on netbsd/arm64 after CL 797880 * go#80369 os: TestRootConsistencyRemoveAll fails on Plan 9 after CL 797880 * go#80394 runtime: arm64 found pointer to free object with safe code * go#80441 runtime: uninitialized register due to wrong ABI in mach_vm_region_trampoline leads to libc following garbage stack data as a pointer * go#80478 cmd/compile: riscv64 miscompiles struct copy, corrupting a []byte slice field * go#80499 runtime: js/wasm: 'found bad pointer in Go heap' -- link-layout-constant value recorded as a pointer in the write-barrier buffer * go#80579 cmd/compile: regalloc uses unreliable type data (like v.Type.IsSigned()) to choose the restore of spills * go#80606 crypto/tls: escape hatch for FIPS 140-3 mode Extended Master Secret enforcement * go#80609 net, x/net/dns/dnsmessage: panic when parsing invalid SVCB record * go#80615 cmd/compile: mips64le misscompile OffPtr by a const which doesn't fit 32bits resulting in panic * go#80617 cmd/compile: mips/mips64, multiply/divide results spilled from HI/LO corrupted w/ big stack frames * go#80619 cmd/compile: prove bug causes invalid indirect call * go#80715 runtime: fpTracebackPartialExpand SIGSEGV under high panic load