CVE-2026-88840

Busybox: busybox: tls ssl_server reads one byte out of bounds when parsing truncated clienthello

MEDIUM
5.3
CVSS Score
Published: September 23, 2026 at 05:45 PM UTC
Updated: September 26, 2026 at 11:16 PM UTC
1 product affected across 1 vendorHardened Images

Using Red Hat Hardened Images by Red Hat?

Get instant alerts when new vulnerabilities affect Red Hat Hardened Images - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

VDB Entryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-88840
Issue Trackingx_refsource_REDHAT
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2531354

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-125

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card