CVE-2026-15340 PUBLISHED

Savannah lwIP SMTP client Classic Buffer Overflow

Assigner: icscert
Reserved: 09.07.2026 Published: 09.10.2026 Updated: 09.10.2026

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

Metrics

CVSS 3.1
CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Savannah
Product	lwIP SMTP client
Versions	Default: unaffected Version 2.2.1 is affected Version patch_125_smtp_txbuf.diff is unaffected Version git commit (614420f82c8729d070e01464c0dddb3c9525c772) is unaffected

Solutions

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)

Credits

xchglabs reported this vulnerability directly to Savannah and then disclosed once the fix was released. finder

References

Problem Types

CWE-120 CWE