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Fencer Vulns
high 7.5

CVE-2026-88830 json

Busybox: busybox: tls montgomery reduction allocates bytes instead of digits, causing a pre-auth heap buffer overflow

published 2026-09-23 47 d ago modified 2026-09-24 46 d ago also EUVD-2026-85425

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

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

Patch / fix

  • busybox SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.35.0-150400.3.23.1
  • busybox SLE Module for Basesystem 15 SP7 1.37.0-150700.18.24.1
  • busybox Linux Micro 6.0 1.36.1-159998.1.1
  • busybox SLES for SAP applications 16.0, SLES 16.0 1.37.0-160000.8.1
  • busybox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.35.0-10.12.1

suse advisories SUSE-SU-2026:4798-1SUSE-SU-2026:4773-1SUSE-SU-2026:4760-1SUSE-SU-2026:24137-1SUSE-SU-2026:24215-1

  • busybox openSUSE Leap 16.0 1.37.0-160000.8.1
  • busybox openSUSE Tumbleweed 1.38.0-3.1

opensuse advisories openSUSE-SU-2026:22067-1openSUSE-SU-2026:11954-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-88830 updated cvss 7.5

busybox: busybox: TLS Montgomery reduction allocates bytes instead of digits, causing a pre-auth heap buffer overflow

  • Red Hat Hardened Images busybox
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
46 d ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Hardened Images

Classification

Weakness
  • CWE-131 Incorrect Calculation of Buffer Size

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.