CVE-2026-85091
High · 7.4CVSS
7.4
EPSS
0.6%
Published
Sep 3, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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