CVE-2026-88830CWE-131

CVE-2026-88830

High · published September 23, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
27.6
In the wild
Unconfirmed
What it is

A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00351 · 27.6th percentile
Weakness
CWE-131 · Incorrect Calculation of Buffer Size
Published
2026-09-23T21:17Z
References (2)
https://access.redhat.com/security/cve/CVE-2026-88830 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2531344 · [email protected]
EPSS history
Timeline
  • 25 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 23 SEP 17:04Z
    Busybox: busybox: tls montgomery reduction allocates bytes instead of digits, causing a pre-auth heap buffer overflow
    cvelistv5