SECURITY UPDATE: memory corruption in FTS5 full-text search extension
debian/patches/CVE-2026-11822-and-11824.patch: tighten leaf-page
validation in fts5LeafRead() to reject pages with szLeaf < 4. Closes
both the OOB read in fts5LeafSeek() (CVE-2026-11822) and the heap
buffer overflow via integer underflow in fts5ChunkIterate()
(CVE-2026-11824) at a single chokepoint.