---
id: CVE-2026-119053
title: >-
  lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read via
  snmp_pbuf_stream_writeto()
summary: >-
  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 c…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-125
vendor: lwIP
product: lwIP
affected:
  - lwIP >= 2.0.0 <= 2.2.1
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-29T14:01:35.973034Z'
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T14:01:51.233Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-119053'
references:
  - url: >-
      https://github.com/lwip-tcpip/lwip/commit/e98415014aca66ef0daefded8020763b9279a3b2
    label: Patch Commit
  - url: 'https://github.com/lwip-tcpip/lwip'
  - url: >-
      https://github.com/lwip-tcpip/lwip/blob/77dcd25a72509eb83f72b033d219b1d40cd8eb95/src/apps/snmp/snmp_pbuf_stream.c#L111-L122
  - url: >-
      https://www.vulncheck.com/advisories/lwip-2.0.0-through-2.2.1-snmp-agent-out-of-bounds-read-via-snmp-pbuf-stream-writeto
    label: >-
      VulnCheck Advisory: lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read
      via snmp_pbuf_stream_writeto()
tags:
  - cve.org
epss: 0.00482
epssPercentile: 0.41836
ingestedAt: '2026-11-01T20:00:16.944Z'
---

## Overview

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

- `lwIP >= 2.0.0 <= 2.2.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.