CVE-2026-15340

Savannah lwIP SMTP client Classic Buffer Overflow

State: Published
Severity: 9.3 Critical
Published: Oct 9, 2026
Updated: Oct 11, 2026
Reserved: Jul 9, 2026

Description

lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	icscert
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	icscert

Weaknesses

CWE-120

Affected Products

Product	Versions
lwIP SMTP clientSavannah	2.2.1Affected patch_125_smtp_txbuf.diffNot affected git commit (614420f82c8729d070e01464c0dddb3c9525c772)Not affected

References

https://www.cisa.gov/news-events/ics-advisories/icsa-26-279-02
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-279-02.json

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