CVE-2026-95831: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-9ppr-x3mg-6jg2
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CVSS 7.8
CWE-506
Published
Advisory Summary

CVE-2026-95831 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-506: Embedded Malicious Code) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product contains code that appears to be malicious in nature.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-95831 at a Glance

CVE Identifier CVE-2026-95831
GHSA Identifier GHSA-9ppr-x3mg-6jg2
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-506: Embedded Malicious Code
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.8

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

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

How to Fix CVE-2026-95831

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-2026-95831, 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-506: Embedded Malicious Code, where the product contains code that appears to be malicious in nature. 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

Crypt::SelfCertificate versions from 1.01 through 1.05 for Perl contains malware which executes Python code from an obfuscated URL. The generate_certificate runs a Python script saved as a certificate file. The pyhton script attempts to retrieve code from a hardcoded http URL that is obfuscated with base64 encoding and run the response body directly. The impact is that arbitrary code can be invoked as the user, without a dropped script being saved on the affected host. The releases have no test scripts nor build hooks. The intention may have been to trigger the payload after installation. For version 1.01, the dropper script is in lib/Crypt/SelfCertificate/sample/validate.p12. For version 1.05, the dropper script is in lib/Crypt/SelfCertificate/sample/cert7.pem. The SHA-256 digests of the files are fbff21f45ff748365062a5e36fb2d72558cad82a507a6f357f320b4fcdf07760 Crypt-SelfCertificate-1.01.tar.gz 27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/validate.p12 9fdfa7d69b034b77d4510cda567e8da1e486ca81c7daaadc5732a45c41d71991 Crypt-SelfCertificate-1.05.tar.gz 27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/cert7.pem

References

NVD — CVE-2026-95831 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-95831
www.nntp.perl.org/group/perl.cpan.tes... WEB
https://www.nntp.perl.org/group/perl.cpan.testers.discuss/2026/09/msg4754.html
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/09/22/21
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/09/23/2
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/09/23/3

Frequently Asked Questions

What is CVE-2026-95831?
CVE-2026-95831 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-506: Embedded Malicious Code.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-95831?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-95831?
CVE-2026-95831 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-95831?
CVE-2026-95831 is classified under CWE-506: Embedded Malicious Code (The product contains code that appears to be malicious in nature.).
How can I check Maven dependencies for CVE-2026-95831?
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-9ppr-x3mg-6jg2",
  "modified" : "2026-09-23T18:31:40Z",
  "published" : "2026-09-22T21:31:27Z",
  "aliases" : [ "CVE-2026-95831" ],
  "details" : "Crypt::SelfCertificate versions from 1.01 through 1.05 for Perl contains malware which executes Python code from an obfuscated URL.\n\nThe generate_certificate runs a Python script saved as a certificate file.  The pyhton script attempts to retrieve code from a hardcoded http URL that is obfuscated with base64 encoding and run the response body directly.\n\nThe impact is that arbitrary code can be invoked as the user, without a dropped script being saved on the affected host.\n\nThe releases have no test scripts nor build hooks.  The intention may have been to trigger the payload after installation.\n\nFor version 1.01, the dropper script is in lib/Crypt/SelfCertificate/sample/validate.p12.\n\nFor version 1.05, the dropper script is in lib/Crypt/SelfCertificate/sample/cert7.pem.\n\nThe SHA-256 digests of the files are\n\n    fbff21f45ff748365062a5e36fb2d72558cad82a507a6f357f320b4fcdf07760 Crypt-SelfCertificate-1.01.tar.gz\n    27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/validate.p12\n\n    9fdfa7d69b034b77d4510cda567e8da1e486ca81c7daaadc5732a45c41d71991 Crypt-SelfCertificate-1.05.tar.gz\n    27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/cert7.pem",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-95831"
  }, {
    "type" : "WEB",
    "url" : "https://www.nntp.perl.org/group/perl.cpan.testers.discuss/2026/09/msg4754.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/09/22/21"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/09/23/2"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/09/23/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-506" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-22T19:17:00Z"
  }
}