CVE-2026-15340

Savannah lwIP SMTP client Classic Buffer Overflow

Published Oct 9, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.

Remediation

Vendor Solution

xchglabs reports that the vulnerability was fixed and released in the following patch: patch_125_smtp_txbuf.diff . This is available as available as git commit (614420f82c8729d070e01464c0dddb3c9525c772)

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Savannah
Savannah lwip Smtp Client
Vendors & Products Savannah
Savannah lwip Smtp Client
Type Values Removed Values Added
Description lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.
Title Savannah lwIP SMTP client Classic Buffer Overflow
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Oct 11, 2026, 5:05 PM
Reserved
Jul 9, 2026, 7:50 PM
Status
Awaiting Analysis
Published
Oct 9, 2026, 3:17 PM
Modified
Oct 11, 2026, 5:17 PM