Vulnerability · Published Oct 29, 2026 · Assigned by VulnCheck
CVE-2026-119053lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read via snmp_pbuf_stream_writeto()
Medium 5.3
In plain English
A medium-severity out-of-bounds read in lwIP from lwIP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 58.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
lwIP 2.0.0 through 2.2.1 built with the SNMP agent contains an out-of-bounds read vulnerability in snmp_pbuf_stream_writeto() that bounds copies by pbuf->len instead of remaining bytes. Remote unauthenticated attackers knowing the read community can send fragmented SNMP requests to receive adjacent receive-buffer or pool memory echoed in responses.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | lwip | no fix listed | DEBIAN-CVE-2026-119053 |
| Debian:13 | lwip | no fix listed | DEBIAN-CVE-2026-119053 |
| Debian:14 | lwip | no fix listed | DEBIAN-CVE-2026-119053 |
| Ubuntu:26.10 | lwip | no fix listed | UBUNTU-CVE-2026-119053 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- Patch Commit patch
- https://github.com/lwip-tcpip/lwip product
- https://github.com/lwip-tcpip/lwip/blob/77dcd25a72509eb83f72b033d219b1d40cd8eb95/src/apps/snmp/snmp_pbuf_stream.c#L111-L122 technical-description
- VulnCheck Advisory: lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read via snmp_pbuf_stream_writeto() third-party-advisory