Description
A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.
Published: 2026-09-23
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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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

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History

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'}


Subscriptions

Redhat Hummingbird
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-23T17:04:57.011Z

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

Link: CVE-2026-88830

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-88830

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses