Update to 6.9.13.50

Summary

This update fixes several security vulnerabilities, including multiple high-severity CVEs: Security fixes

• CVE-2026-33901 (High) — Heap buffer overflow in the MVG decoder that could result in an out-of-bounds write when processing a crafted image.
• CVE-2026-33908 (High) — Recursive DestroyXMLTree() call with no depth limit causes stack exhaustion when processing deeply nested XML structures, resulting in a Denial of Service (DoS).
• CVE-2026-40310 (High) — Heap out-of-bounds write in the JP2 encoder triggered when a user specifies an invalid sampling index.

Additional security and bug fixes are included in the upstream releases between 6.9.13.25 and 6.9.13.49. See the upstream release history at: https://github.com/ImageMagick/ImageMagick6/releases