CVE-2026-88830

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

Published Sep 23, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.

Remediation

Vendor Workaround

Do not use the BusyBox ssl_server applet in production environments. Use a well-maintained TLS implementation such as OpenSSL or GnuTLS instead. Ensure system-level exploit mitigations (ASLR, PIE, RELRO, stack protectors) are enabled.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Busybox
Busybox busybox
Vendors & Products Busybox
Busybox busybox
Type Values Removed Values Added
Description A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.
Title Busybox: busybox: tls montgomery reduction allocates bytes instead of digits, causing a pre-auth heap buffer overflow
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-131
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Sep 24, 2026, 4:26 PM
Reserved
Sep 10, 2026, 9:42 AM
Status
Awaiting Analysis
Published
Sep 23, 2026, 5:17 PM
Modified
Sep 23, 2026, 8:17 PM
Severity
Important
Public date
Sep 23, 2026, 4:35 PM