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

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Fixes

Solution

No solution given by the 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.

History

Thu, 24 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Wed, 23 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 23 Sep 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Busybox
Busybox busybox
Vendors & Products Busybox
Busybox busybox

Wed, 23 Sep 2026 17:15:00 +0000

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-23T19:44:18.375Z

Reserved: 2026-09-10T09:42:04.559Z

Link: CVE-2026-88830

cve-icon Vulnrichment

Updated: 2026-09-23T18:36:41.270Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T17:17:18.427

Modified: 2026-09-23T20:17:20.750

Link: CVE-2026-88830

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-23T16:35:00Z

Links: CVE-2026-88830 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T20:00:08Z

Weaknesses