CVE-2026-15340 lwIP SMTP client - Buffer Overflow

lwIP SMTP client contains a buffer overflow caused by lack of input size validation, letting attackers potentially execute arbitrary code, exploit requires crafted input.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.60% 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:H/I:H/A:H
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-120

Vendor fix

Update to the latest version with input size validation fixes.

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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