Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection

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.

Scores

EPSS (exploitation in 30 days)

0.25% · top 83% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.

Weakness

• CWE-626: Null Byte Interaction Error (Poison Null Byte) (opens in a new tab)All about CWE-626 and its CVEs

Affected products

• netty · netty

  • affected 4.2.0.Final – < 4.2.16.Final
  • unaffected 4.2.16.Final

• netty · netty

  • affected < 4.1.137.Final
  • unaffected 4.1.137.Final

References (2)

• GitHub Security Advisory (GHSA-cc6x-ffm5-83wf) (opens in a new tab)vendor-advisory
• VulnCheck Advisory: Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection (opens in a new tab)third-party-advisory

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-62380](https://trackcve.app/badge/CVE-2026-62380.svg)](https://trackcve.app/cve/CVE-2026-62380)

Record last updated 26 Aug 2026, 16:16 UTC.