HIGHVulnerability
CVE-2026-85091
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.
Properties
- severity
- HIGH
- score
- 7.4
- epss_score
- 0.00442
- cve_id
- CVE-2026-85091
- signal_observed_at
- 2026-09-15T21:12:51+00:00
- vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
- published_at
- 2026-09-03T13:06:20.573
- last_modified
- 2026-09-09T20:41:07.123
- epss_percentile
- 0.37443
Related Entities (3)
ENRICHED_BY (1)
→[Source]FIRST EPSS
HAS_WEAKNESS (1)
→[Weakness]Out-of-bounds Write
DESCRIBED_BY (1)
→[Source]NVD
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