CVE-2026-86871CWE-190CWE-20

CVE-2026-86871

Medium · published October 20, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
33.1
In the wild
Unconfirmed
What it is

An integer underflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An attacker with control of a network file server may be able to cause unexpected system termination.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00400 · 33.1th percentile
Weaknesses
CWE-190 · Integer Overflow or Wraparound; CWE-20 · Improper Input Validation
Published
2026-10-20T05:17Z
References (3)
https://support.apple.com/en-us/149035 · [email protected]https://support.apple.com/en-us/149042 · [email protected]https://support.apple.com/en-us/149043 · [email protected]
EPSS history
Timeline
  • 21 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 20 OCT 00:50Z
    An integer underflow was addressed with improved input validation
    cvelistv5
  • 20 OCT 00:50Z
    An integer underflow was addressed with improved input validation
    cvelistv5