Vulnerability in Netty
CVE-2026-62380
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/netty/netty/security/advisories/GHSA-cc6x-ffm5-83wf (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/netty-before-final-socks-proxy-null-byte-injection (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-62380?
- CVE-2026-62380 is a high-severity vulnerability in Netty, classified under CWE-626. CVSS score: 7.5/10. Published 2026-08-22.
- How severe is CVE-2026-62380?
- High severity. CVSS v3 base score is 7.5 out of 10.