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CVE-2026-62380— Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection

Quick assessment

Affected
netty netty
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.

Netty（io.netty:netty-codec-socks）在 4.2.0.Final 到 4.2.16.Final 版本，以及 4.1.x 到 4.1.136.Final 版本中，存在空字节、CRLF 和凭据注入漏洞，影响 SOCKS4（Socks4ClientEncoder）和 SOCKS5（Socks5ClientEncoder）客户端编码器。这些编码器未能正确验证域名地址和认证（用户名/密码）字段。攻击者若能控制这些字段，可以注入空字节或 CRLF 字符以截断或修改值，可能导致域名伪装、SOCKS4

CVSS 6.3 · Medium EPSS 0.56% · P44

Affected Version Matrix 4

VendorProduct Version RangeStatus
netty netty 4.2.0.Final< 4.2.16.Final affected
4.2.16.Final unaffected
< 4.1.137.Final affected
4.1.137.Final unaffected
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I. Basic Information for CVE-2026-62380

Vulnerability Information
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Vulnerability Title
Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEncoder) client encoders, which fail to validate domain address and authentication (username/password) fields. An attacker able to control these fields can inject null bytes or CRLF characters to truncate or alter values, potentially enabling domain spoofing, SOCKS4 userid truncation, authentication data injection, and protocol confusion. Fixed in 4.2.17.Final and 4.1.137.Final.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
空字节交互错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty 4.2.0.Final ~ 4.2.16.Final -
netty netty 0 ~ 4.1.137.Final -

II. Public POCs for CVE-2026-62380

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III. Intelligence Information for CVE-2026-62380

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Vendor Advisories for CVE-2026-62380 (2)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-626

V. Comments for CVE-2026-62380

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