BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message.

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Fixes

Solution

No solution given by the vendor.


Workaround

Do not use BusyBox ssl_server in production deployments. Upstream should add a bounds check to verify len > 0 before reading the compression-methods length byte.

History

Thu, 24 Sep 2026 09:45:00 +0000

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

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

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 23 Sep 2026 18:00:00 +0000

Type Values Removed Values Added
Description BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message.
Title Busybox: busybox: tls ssl_server reads one byte out of bounds when parsing truncated clienthello
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-125
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-23T17:45:34.724Z

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

Link: CVE-2026-88840

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T18:17:10.790

Modified: 2026-09-23T19:40:10.000

Link: CVE-2026-88840

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2026-88840 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-24T09:10:26Z

Weaknesses