Vulnerability · Published Oct 9, 2026 · Assigned by icscert
CVE-2026-15340Savannah lwIP SMTP client Classic Buffer Overflow
Critical 9.8
In plain English
A critical-severity buffer overflow in lwIP SMTP client from Savannah. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.4%top 69.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | lwip | no fix listed | DEBIAN-CVE-2026-15340 |
| Debian:13 | lwip | no fix listed | DEBIAN-CVE-2026-15340 |
| Debian:14 | lwip | no fix listed | DEBIAN-CVE-2026-15340 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Savannah | lwIP SMTP client | 2.2.1 |
Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H