Out-of-bounds Read in Lwip
CVE-2026-119053
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/lwip-tcpip/lwip/commit/e98415014aca66ef0daefded8020763b9279a3b2 (patch)
- github.com/lwip-tcpip/lwip (product)
- github.com/lwip-tcpip/lwip/blob/77dcd25a72509eb83f72b033d219b1d40cd8eb95/src/ap… (technical-description)
- www.vulncheck.com/advisories/lwip-2.0.0-through-2.2.1-snmp-agent-out-of-bounds-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119053?
- CVE-2026-119053 is a medium-severity vulnerability in Lwip, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-10-29.
- How severe is CVE-2026-119053?
- Medium severity. CVSS v3 base score is 5.3 out of 10.