CVE-2026-41207: Netty incubator codec ohttp Netty-incubator-codec-ohttp's HPKEContext Operations May Produce Vulnerability

MODERATE
Advisory Identifier: GHSA-f659-372h-6x3x
Share
CWE-330
Published
Advisory Summary

CVE-2026-41207 is a MODERATE netty-incubator-codec-ohttp's hpkecontext operations may produce vulnerability (CWE-330: Use of Insufficiently Random Values) affecting Netty incubator codec ohttp libraries in the Maven ecosystem. The issue involves netty-incubator-codec-ohttp's hpkecontext operations may produce empty byte[] on failures. Remediation is available by upgrading affected packages to version 0.0.21.Final.

CVE-2026-41207 at a Glance

CVE Identifier CVE-2026-41207
GHSA Identifier GHSA-f659-372h-6x3x
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-330: Use of Insufficiently Random Values
Affected Product Netty incubator codec ohttp
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-41207

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

io.netty.incubator:netty-incubator-codec-ohttp fixed: 0.0.21.Final 
<dependency>
    <groupId>io.netty.incubator</groupId>
    <artifactId>netty-incubator-codec-ohttp</artifactId>
    <version>0.0.21.Final</version>
</dependency>
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 -Dincludes=io.netty.incubator

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-41207, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.netty.incubator

Analyze the terminal output to locate any version of Netty incubator codec ohttp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.21.Final), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.netty.incubator 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-330: Use of Insufficiently Random Values, where the product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. In Netty incubator codec ohttp, 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

HKDF_expand: returns non-NULL on failure. The byte[] is filled with zeros and has no way to distinguish success from failure. Since this output is used as HKDF key material for the response AEAD, a failure silently produces an all-zero key. When EVP_HPKE_CTX_export fails it also returns an empty byte[] array filled with zeros. This byte[] feeds directly into OHttpCrypto.createResponseAEAD(...). A silent all-zero export secret would produce a deterministic, attacker-predictable AEAD key.

CVE-2026-41207 Affected Netty incubator codec ohttp Versions

1 component(s)
Fixed Versions:
0.0.21.Final
Product / Package Ecosystem Affected Versions Fixed Version
io.netty.incubator:netty-incubator-codec-ohttp
maven/io.netty.incubator/netty-incubator-codec-ohttp
Maven
< 0.0.21.Final
0.0.21.Final

References

GitHub Advisory / Wiki ADVISORY
https://github.com/netty/netty-incubator-codec-ohttp/security/advisories/GHSA-f659-372h-6x3x
NVD — CVE-2026-41207 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41207
Security Fix Commit FIX COMMIT
https://github.com/netty/netty-incubator-codec-ohttp/commit/3d3b4e527fc82ad0fe3db1af951ffd0ec9a10680
Netty incubator codec ohttp Source Repository REPOSITORY
https://github.com/netty/netty-incubator-codec-ohttp

Frequently Asked Questions

What is CVE-2026-41207?
CVE-2026-41207 is a security vulnerability in Netty incubator codec ohttp involving netty-incubator-codec-ohttp's HPKEContext operations may produce empty byte[] on failures under CWE-330: Use of Insufficiently Random Values.
Which Netty incubator codec ohttp versions are affected?
Affected versions include releases prior to 0.0.21.Final across affected packages: io.netty.incubator:netty-incubator-codec-ohttp.
What version fixes CVE-2026-41207?
Upgrading to 0.0.21.Final (or the latest patched release for your respective branch) resolves the vulnerability.
Is netty-incubator-codec-ohttp affected?
Yes, io.netty.incubator:netty-incubator-codec-ohttp is affected in releases prior to 0.0.21.Final. Upgrade your dependency to 0.0.21.Final or later.
What CWE is associated with CVE-2026-41207?
CVE-2026-41207 is classified under CWE-330: Use of Insufficiently Random Values (The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.).
How can I check Maven dependencies for CVE-2026-41207?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.netty.incubator'. 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-f659-372h-6x3x",
  "modified" : "2026-06-09T11:53:42Z",
  "published" : "2026-05-26T23:08:26Z",
  "aliases" : [ "CVE-2026-41207" ],
  "summary" : "netty-incubator-codec-ohttp's HPKEContext operations may produce empty byte[] on failures",
  "details" : "HKDF_expand: returns non-NULL on failure. The byte[] is filled with zeros and has no way to distinguish success from failure. Since this output is used as HKDF key material for the response AEAD, a  failure silently produces an all-zero key.\n\nWhen EVP_HPKE_CTX_export fails it also returns an empty byte[] array filled with zeros. This byte[] feeds directly into OHttpCrypto.createResponseAEAD(...).  A silent all-zero export secret would produce a deterministic, attacker-predictable AEAD key.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.netty.incubator:netty-incubator-codec-ohttp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.21.Final"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/netty/netty-incubator-codec-ohttp/security/advisories/GHSA-f659-372h-6x3x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-41207"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/netty/netty-incubator-codec-ohttp/commit/3d3b4e527fc82ad0fe3db1af951ffd0ec9a10680"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/netty/netty-incubator-codec-ohttp"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-330" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-26T23:08:26Z",
    "nvd_published_at" : "2026-06-04T18:16:30Z"
  }
}