Medium severity · published Sep 23, 2026
CVE-2026-88840
Busybox: busybox: tls ssl_server reads one byte out of bounds when parsing truncated clienthello
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
BusyBox TLS get_client_hello() reads past the end of the input buffer when parsing a truncated ClientHello message.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88840
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88840
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-88840
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2531354
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