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

Overview

Severity

High (CVSS 7.4)

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-05

Last Updated

2026-10-17

EPSS Score

0.36% (percentile: 28.1%)

Affected Products (5)

Other

• 21915-17084
• 21222-17084
• 21767-17084
• 21655-17084
• 21813-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-05: Information published.
• 2026-09-09: Information published.
• 2026-09-09: Information published.
• 2026-09-23: Information published.
• 2026-09-24: Information published.
• 2026-09-25: Information published.
• 2026-10-17: Information published.