What’s Vulnerable › Vulnerabilities

CVE-2026-15340: Savannah lwIP SMTP client Classic Buffer Overflow

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-11
• Weakness: CWE-120

Description

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

Affected products

• Savannah lwIP SMTP client: 2.2.1

References

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

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