CVE-2026-87743: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-pw2v-hfg7-72m6
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CVSS 7.5
CWE-551
Published
Advisory Summary

CVE-2026-87743 is a HIGH (CVSS 7.5) security vulnerability vulnerability (CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization) affecting Software libraries in the Maven ecosystem. The weakness occurs when if a web server does not fully parse requested urls before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-87743 at a Glance

CVE Identifier CVE-2026-87743
GHSA Identifier GHSA-pw2v-hfg7-72m6
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
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:H/I:N/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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-87743

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-2026-87743, 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-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization, where if a web server does not fully parse requested urls before it examines them for authorization, it may be possible for an attacker to bypass authorization protection. 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 Quarkus HTTP security. An unauthenticated attacker can exploit a discrepancy in how paths are normalized between the security matcher and HTTP request dispatchers. This allows the attacker to craft a URL that the security matcher considers public, but which is then routed to a protected endpoint, leading to an authorization bypass and potential unauthorized access to sensitive information.

References

NVD — CVE-2026-87743 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87743
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69440
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69470
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-87743
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2530523

Frequently Asked Questions

What is CVE-2026-87743?
CVE-2026-87743 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-87743?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-87743?
CVE-2026-87743 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-87743?
CVE-2026-87743 is classified under CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization (If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.).
How can I check Maven dependencies for CVE-2026-87743?
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-pw2v-hfg7-72m6",
  "modified" : "2026-09-22T12:30:24Z",
  "published" : "2026-09-18T12:31:19Z",
  "aliases" : [ "CVE-2026-87743" ],
  "details" : "A flaw was found in Quarkus HTTP security. An unauthenticated attacker can exploit a discrepancy in how paths are normalized between the security matcher and HTTP request dispatchers. This allows the attacker to craft a URL that the security matcher considers public, but which is then routed to a protected endpoint, leading to an authorization bypass and potential unauthorized access to sensitive information.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-87743"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:69440"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2026:69470"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-87743"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2530523"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-551" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-18T10:17:07Z"
  }
}