CVE-2019-9636: Software Security Vulnerability Vulnerability

CRITICAL

Advisory Identifier: GHSA-v82r-hg27-h4wh

CVSS 9.8

Published 2022-05-13

Advisory Summary

CVE-2019-9636 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-173: Improper Handling of Alternate Encoding) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not properly handle when an input uses an alternate encoding that is valid for the control sphere to which the input is being sent.. Remediation is available in the latest vendor maintenance releases.

CVE-2019-9636 at a Glance

CVE Identifier CVE-2019-9636

GHSA Identifier GHSA-v82r-hg27-h4wh

Severity CRITICAL

CVSS v3.1 Base Score 9.8

CWE Classification CWE-173: Improper Handling of Alternate Encoding

Affected Product Software

Package Ecosystem Maven

Published Date 2022-05-13

Last Updated 2026-10-14

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

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 High (I:H)

Availability High (A:H)

How to Fix CVE-2019-9636

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-2019-9636, 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-173: Improper Handling of Alternate Encoding, where the product does not properly handle when an input uses an alternate encoding that is valid for the control sphere to which the input is being sent. 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

Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.7, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.3, v3.7.3rc1, v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.

References

NVD — CVE-2019-9636 NVD

https://nvd.nist.gov/vuln/detail/CVE-2019-9636

Software Source Repository REPOSITORY

https://github.com/python/cpython/pull/12201

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Software Security Information SECURITY

https://python-security.readthedocs.io/vuln/urlsplit-nfkc-normalization.html

Software Security Information SECURITY

https://security.gentoo.org/glsa/202003-26

Software Security Information SECURITY

https://security.netapp.com/advisory/ntap-20190517-0001

usn.ubuntu.com/4127-1 WEB

https://usn.ubuntu.com/4127-1

usn.ubuntu.com/4127-2 WEB

https://usn.ubuntu.com/4127-2

Software Security Information SECURITY

https://www.oracle.com/security-alerts/cpujan2020.html

Software Security Information SECURITY

https://www.oracle.com/security-alerts/cpujul2022.html

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lists.debian.org/debian-lts-announce... WEB

https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html

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https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html

cert-portal.siemens.com/productcert/html/ss... WEB

https://cert-portal.siemens.com/productcert/html/ssa-398330.html

bugs.python.org/issue36216 WEB

https://bugs.python.org/issue36216

access.redhat.com/errata/rhsa-2019:31... WEB

https://access.redhat.com/errata/RHSA-2019:3170

access.redhat.com/errata/rhsa-2019:29... WEB

https://access.redhat.com/errata/RHSA-2019:2980

access.redhat.com/errata/rhsa-2019:14... WEB

https://access.redhat.com/errata/RHSA-2019:1467

access.redhat.com/errata/rhsa-2019:09... WEB

https://access.redhat.com/errata/RHSA-2019:0997

access.redhat.com/errata/rhsa-2019:09... WEB

https://access.redhat.com/errata/RHSA-2019:0981

access.redhat.com/errata/rhsa-2019:09... WEB

https://access.redhat.com/errata/RHSA-2019:0902

access.redhat.com/errata/rhsa-2019:08... WEB

https://access.redhat.com/errata/RHSA-2019:0806

access.redhat.com/errata/rhsa-2019:07... WEB

https://access.redhat.com/errata/RHSA-2019:0765

access.redhat.com/errata/rhsa-2019:07... WEB

https://access.redhat.com/errata/RHSA-2019:0710

access.redhat.com/errata/rhba-2019:09... WEB

https://access.redhat.com/errata/RHBA-2019:0959

access.redhat.com/errata/rhba-2019:07... WEB

https://access.redhat.com/errata/RHBA-2019:0764

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https://access.redhat.com/errata/RHBA-2019:0763

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lists.debian.org/debian-lts-announce... WEB

https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html

lists.debian.org/debian-lts-announce... WEB

https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html

Software Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00092.html

Software Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00097.html

Software Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00024.html

Software Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00050.html

Software Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00042.html

Software Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html

Software Security Information SECURITY

http://www.securityfocus.com/bid/107400

Frequently Asked Questions

What is CVE-2019-9636?

CVE-2019-9636 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-173: Improper Handling of Alternate Encoding.

Which Software versions are affected?

Affected versions include releases prior to current release patches.

What version fixes CVE-2019-9636?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

What is the CVSS score of CVE-2019-9636?

CVE-2019-9636 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2019-9636?

CVE-2019-9636 is classified under CWE-173: Improper Handling of Alternate Encoding (The product does not properly handle when an input uses an alternate encoding that is valid for the control sphere to which the input is being sent.).

How can I check Maven dependencies for CVE-2019-9636?

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-v82r-hg27-h4wh",
  "modified" : "2026-10-14T09:31:18Z",
  "published" : "2022-05-13T01:14:02Z",
  "aliases" : [ "CVE-2019-9636" ],
  "details" : "Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.7, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.3, v3.7.3rc1, v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-9636"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python/cpython/pull/12201"
  }, {
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  "database_specific" : {
    "cwe_ids" : [ "CWE-173" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2019-03-08T21:29:00Z"
  }
}

CVSS V3

9.8 CRITICAL

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 High (I:H)

Availability High (A:H)

Vector String

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Advisory Metadata

Source ID: GHSA-v82r-hg27-h4wh
Schema Version: 1.4.0
Published: 2022-05-13 01:14
Last Modified: 2026-10-14 09:31
Database Record File: advisories/unreviewed/2022/05/GHSA-v82r-hg27-h4wh/GHSA-v82r-hg27-h4wh.json