CVE-2026-15340
Received Received - Intake

SMTP Client Buffer Overflow in lwIP

Publication date: 2026-10-09

Last updated on: 2026-10-09

Assigner: ICS-CERT

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

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Meta Information

Published
2026-10-09
Last Modified
2026-10-09
Generated
2026-10-09
AI Q&A
2026-10-09
EPSS Evaluated
N/A
NVD
CVE-2026-15340
EUVD
EUVD-2026-95820

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Savannah lwIP SMTP client 2.2.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

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Executive Summary

CVE-2026-15340 is a buffer overflow vulnerability in the lwIP SMTP client. It occurs because the client does not validate input sizes, allowing attackers to send oversized data that exceeds buffer limits. This can lead to memory corruption, crashes, or remote code execution.

Impact Analysis

Exploitation could allow attackers to execute arbitrary code on affected systems, crash devices, or gain unauthorized access. This may disrupt services, compromise sensitive data, or enable further attacks within the network.

Mitigation Strategies

Apply the patch labeled patch_125_smtp_txbuf.diff (git commit 614420f82c8729d070e01464c0dddb3c9525c772) to fix the buffer overflow issue. Minimize network exposure for affected devices by isolating them behind firewalls and using secure remote access methods like VPNs.

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