CVE-2026-49332: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-f2m2-cc3f-h4j2
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CVSS 8.5
CWE-436
Published
Advisory Summary

CVE-2026-49332 is a HIGH (CVSS 8.5) security vulnerability vulnerability (CWE-436: Interpretation Conflict) affecting Software libraries in the Maven ecosystem. The weakness occurs when product a handles inputs or steps differently than product b, which causes a to perform incorrect actions based on its perception of b's state.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-49332 at a Glance

CVE Identifier CVE-2026-49332
GHSA Identifier GHSA-f2m2-cc3f-h4j2
Severity HIGH
CVSS v3.1 Base Score 8.5
CWE Classification CWE-436: Interpretation Conflict
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.5

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

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

How to Fix CVE-2026-49332

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-2026-49332, 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-436: Interpretation Conflict, where product a handles inputs or steps differently than product b, which causes a to perform incorrect actions based on its perception of b's state. 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

A flaw was found in openshift/oauth-proxy. The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application.

References

NVD — CVE-2026-49332 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49332
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50681
access.redhat.com/errata/rhsa-2026:50... WEB
https://access.redhat.com/errata/RHSA-2026:50758
access.redhat.com/errata/rhsa-2026:51... WEB
https://access.redhat.com/errata/RHSA-2026:51007
access.redhat.com/errata/rhsa-2026:51... WEB
https://access.redhat.com/errata/RHSA-2026:51013
access.redhat.com/errata/rhsa-2026:51... WEB
https://access.redhat.com/errata/RHSA-2026:51022
access.redhat.com/errata/rhsa-2026:51... WEB
https://access.redhat.com/errata/RHSA-2026:51025
access.redhat.com/errata/rhsa-2026:51... WEB
https://access.redhat.com/errata/RHSA-2026:51038
access.redhat.com/errata/rhsa-2026:54... WEB
https://access.redhat.com/errata/RHSA-2026:54188
access.redhat.com/errata/rhsa-2026:54... WEB
https://access.redhat.com/errata/RHSA-2026:54206
access.redhat.com/errata/rhsa-2026:56... WEB
https://access.redhat.com/errata/RHSA-2026:56912
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60023
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-49332
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2483253

Frequently Asked Questions

What is CVE-2026-49332?
CVE-2026-49332 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-436: Interpretation Conflict.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-49332?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-49332?
CVE-2026-49332 has a CVSS v3.1 base score of 8.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.
What CWE is associated with CVE-2026-49332?
CVE-2026-49332 is classified under CWE-436: Interpretation Conflict (Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.).
How can I check Maven dependencies for CVE-2026-49332?
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 
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  "id" : "GHSA-f2m2-cc3f-h4j2",
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  "aliases" : [ "CVE-2026-49332" ],
  "details" : "A flaw was found in openshift/oauth-proxy. The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application.",
  "severity" : [ {
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  }, {
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  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:51025"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:51038"
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  "database_specific" : {
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    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-28T13:18:46Z"
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}