CVE-2026-62380 PUBLISHED

Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection

Assigner: VulnCheck
Reserved: 13.07.2026 Published: 22.08.2026 Updated: 22.08.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 6.3

Product Status

Vendor netty
Product netty
Versions Default: unaffected
  • affected from 4.2.0.Final to 4.2.16.Final (excl.)
  • Version 4.2.16.Final is unaffected
Vendor netty
Product netty
Versions Default: unaffected
  • affected from 0 to 4.1.137.Final (excl.)
  • Version 4.1.137.Final is unaffected

References

Problem Types

  • Null Byte Interaction Error (Poison Null Byte) CWE