CVE-2026-88830 BusyBox - Buffer Overflow

BusyBox contains a heap buffer overflow caused by unit confusion in TLS Montgomery reduction buffer allocation when processing a crafted ClientKeyExchange message, letting remote attackers cause memory corruption, exploit requires crafted message.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.35% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-131

Vendor fix

Update to the latest version of BusyBox.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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