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CVE-2026-119053— lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read via snmp_pbuf_stream_writeto()

Quick assessment

Affected
lwIP lwIP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在启用 SNMP 代理构建的 lwIP 2.0.0 至 2.2.1 版本中， 函数存在越界读取漏洞。该函数在边界拷贝时错误地依据 而非剩余字节数进行限制。若攻击者知晓读取团体名（read community），即可作为远程未认证攻击者发送分片 SNMP 请求，从而在响应中获取相邻的接收缓冲区或内存池数据。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-119053

Vulnerability Information
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Vulnerability Title
lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read via snmp_pbuf_stream_writeto()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lwIP lwIP 2.0.0 ~ 2.2.1 -

II. Public POCs for CVE-2026-119053

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III. Intelligence Information for CVE-2026-119053

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Other References for CVE-2026-119053 (4)

IV. Related Vulnerabilities

Same product: lwIP
Same vendor: lwIP
Same weakness: CWE-125