CISA warns of critical lwIP SMTP client buffer overflow
CISA published ICS advisory ICSA-26-279-02 for a critical buffer overflow in Savannah lwIP SMTP client 2.2.1, tracked as CVE-2026-15340 with a CVSS 3.1 score of 9.8. The flaw allows remote code execution or device crashes. xchglabs reported it and a fix was released as patch_125_smtp_txbuf.diff, commit 614420f82c8729d070e01464c0dddb3c9525c772.
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Attributed quotes
“Successful exploitation of this vulnerability could crash the device being accessed; a buffer overflow condition may allow remote code execution.”
“xchglabs reports that the vulnerability was fixed and released in the following patch: patch_125_smtp_txbuf.diff.”
Summary last validated Oct 6, 2026
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