CVE-2026-62380: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-jmpc-xv4r-m7fw
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CVSS 7.5
CWE-626
Published
Advisory Summary

CVE-2026-62380 is a MODERATE (CVSS 7.5) security vulnerability vulnerability (CWE-626: Null Byte Interaction Error (Poison Null Byte)) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not properly handle null bytes or nul characters when passing data between different representations or components.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-62380 at a Glance

CVE Identifier CVE-2026-62380
GHSA Identifier GHSA-jmpc-xv4r-m7fw
Severity MODERATE
CVSS v3.1 Base Score 7.5
CWE Classification CWE-626: Null Byte Interaction Error (Poison Null Byte)
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-62380

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-62380, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-626: Null Byte Interaction Error (Poison Null Byte), where the product does not properly handle null bytes or nul characters when passing data between different representations or components. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

GitHub Advisory / Wiki ADVISORY
https://github.com/netty/netty/security/advisories/GHSA-cc6x-ffm5-83wf
NVD — CVE-2026-62380 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62380
www.vulncheck.com/advisories/netty-be... WEB
https://www.vulncheck.com/advisories/netty-before-final-socks-proxy-null-byte-injection

Frequently Asked Questions

What is CVE-2026-62380?
CVE-2026-62380 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-626: Null Byte Interaction Error (Poison Null Byte).
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-62380?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-62380?
CVE-2026-62380 has a CVSS v3.1 base score of 7.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2026-62380?
CVE-2026-62380 is classified under CWE-626: Null Byte Interaction Error (Poison Null Byte) (The product does not properly handle null bytes or NUL characters when passing data between different representations or components.).
How can I check Maven dependencies for CVE-2026-62380?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jmpc-xv4r-m7fw",
  "modified" : "2026-08-27T21:31:21Z",
  "published" : "2026-08-22T15:31:02Z",
  "aliases" : [ "CVE-2026-62380" ],
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/netty/netty/security/advisories/GHSA-cc6x-ffm5-83wf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-62380"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/netty-before-final-socks-proxy-null-byte-injection"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-626" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-22T13:16:39Z"
  }
}