CVE-2026-17084: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-w246-x8qv-r8f5
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CWE-436
Published
Advisory Summary

CVE-2026-17084 is a MODERATE 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-2026-17084 at a Glance

CVE Identifier CVE-2026-17084
GHSA Identifier GHSA-w246-x8qv-r8f5
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-436: Interpretation Conflict
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-17084

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-2026-17084, 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

The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attributes such as case-folding behavior updated since Unicode 3.2.0.

References

NVD — CVE-2026-17084 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-17084
Software Source Repository REPOSITORY
https://github.com/python/cpython/issues/155292
Software Source Repository REPOSITORY
https://github.com/python/cpython/pull/155293
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/1e54caa096678a38afcabecabb1ff72400dd6bae
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/69f92ebaec681e9149dfd70fd02d4ed52d2a6296
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/c016c2535b74227fddf2cf7334dbfead6c930214
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/c28b121a4f0b975937c8b5a1b4934bb361d84296
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/c42790b34f634051750e5da340d17c7da19e4784
Security Fix Commit FIX COMMIT
https://github.com/python/cpython/commit/d397a4979cfc80a8cd6c73838aa10e9c8cf5ef72
Software Security Information SECURITY
https://mail.python.org/archives/list/security-announce@python.org/thread/EUHHTC6EV7HCLSUHP25C5VHSV4V2MUZN
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/08/18/2

Frequently Asked Questions

What is CVE-2026-17084?
CVE-2026-17084 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-2026-17084?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-17084?
CVE-2026-17084 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-2026-17084?
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-w246-x8qv-r8f5",
  "modified" : "2026-10-01T03:31:10Z",
  "published" : "2026-08-18T15:31:45Z",
  "aliases" : [ "CVE-2026-17084" ],
  "details" : "The \"stringprep\" module didn't process characters from RFC 3454 tables \nB.2 or B.3 correctly: the latest Unicode codepoint attributes were used \ninstead of the specified Unicode 3.2.0. This behavior would cause \nmismatches when processing domain names using IDNA 2003 (the \"idna\" \ncodec) and the in_table_b2() function of the \"stringprep\" module. This \nonly affects domain names containing characters that were not previously\n registered or had their Unicode attributes such as case-folding \nbehavior updated since Unicode 3.2.0.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/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" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-17084"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/issues/155292"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/pull/155293"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/1e54caa096678a38afcabecabb1ff72400dd6bae"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/5181304bcec9cfc3c15311741c9154cdff2e3fd7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/69f92ebaec681e9149dfd70fd02d4ed52d2a6296"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/7e109d084d55e7eb25837a5f3b47ef9beee547bc"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/c016c2535b74227fddf2cf7334dbfead6c930214"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/c28b121a4f0b975937c8b5a1b4934bb361d84296"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/c42790b34f634051750e5da340d17c7da19e4784"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/commit/d397a4979cfc80a8cd6c73838aa10e9c8cf5ef72"
  }, {
    "type" : "WEB",
    "url" : "https://mail.python.org/archives/list/security-announce@python.org/thread/EUHHTC6EV7HCLSUHP25C5VHSV4V2MUZN"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/08/18/2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-436" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-18T14:16:56Z"
  }
}