High severity · published Sep 23, 2026
CVE-2026-88830
Busybox: busybox: tls montgomery reduction allocates bytes instead of digits, causing a pre-auth heap buffer overflow
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% 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-2026-88830
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88830
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-88830
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2531344
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