Description
lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Savannah | lwIP SMTP client | 2.2.1 | patch_125_smtp_txbuf.diff |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | lwip | No fix yet | — |
| Debian 13 | lwip | No fix yet | — |
| Debian 12 | lwip | No fix yet | — |
Advisories 1
- ICSA-26-279-02 Savannah lwIP SMTP client CISA ICS & IT advisories · Oct 6, 2026