CVE-2026-85091 zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate

zlib versions 1.3.1.2 through 1.3.2 are affected by a heap buffer overflow in the gz_vacate() function. The root cause is an unchecked memmove() that writes beyond the internal input buffer boundary when processing non-blocking gzwrite() operations with stale external buffer pointers . An attacke...