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

2026-09-30T02:03:24.986231+00:00

Affected: zlib

zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.

Most recent entries from all

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