High severity · published Aug 22, 2026
CVE-2026-62380
Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection
7.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
netty · netty
4.2.0.Final before 4.2.16.Final; before 4.1.137.Final · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62380
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62380
Vendor Advisory
https://github.com/netty/netty/security/advisories/GHSA-cc6x-ffm5-83wf
Third Party Advisory
https://www.vulncheck.com/advisories/netty-before-final-socks-proxy-null-byte-injection
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