Domain and credential injection via unvalidated encoder fields
Published Aug 22, 2026 · Updated Aug 22, 2026
Null byte injection in Netty SOCKS client encoders through 4.1.136.Final and 4.2.16.Final allows attackers to alter proxy fields. Socks4ClientEncoder and Socks5ClientEncoder serialize unvalidated NUL bytes and CRLF characters in domain, userid, username, and password values. Exploitation requires attacker control of values passed by consuming code and can redirect domains, truncate identities, or inject authentication data.
Summary
What happened
Null byte injection in Netty SOCKS client encoders through 4.1.136.Final and 4.2.16.Final allows attackers to alter proxy fields. Socks4ClientEncoder and Socks5ClientEncoder serialize unvalidated NUL bytes and CRLF characters in domain, userid, username, and password values. Exploitation requires attacker control of values passed by consuming code and can redirect domains, truncate identities, or inject authentication data.
The record
- CVE
- CVE-2026-62380
- Published
- Aug 22, 2026
- Updated
- Aug 22, 2026
- Vendor
- The Netty Project
- Product
- Netty
- Classifications
- CWE-626
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 22, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <4.1.137.Final
- Affected versionversion=4.2.0.Final <4.2.16.Final
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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