🔐 CVE Alert

CVE-2026-15340

CRITICAL 9.8

Savannah lwIP SMTP client Classic Buffer Overflow

CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th

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

CWE CWE-120
Vendor savannah
Product lwip smtp client
Published Oct 9, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Affected Versions

Savannah / lwIP SMTP client
2.2.1

References

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

Credits

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