CVE-2026-12205: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-88g7-87jg-w4q9
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CVSS 9.1
CWE-323
Published
Advisory Summary

CVE-2026-12205 is a CRITICAL (CVSS 9.1) security vulnerability vulnerability (CWE-323: Reusing a Nonce, Key Pair in Encryption) affecting Software libraries in the Maven ecosystem. The weakness occurs when nonces should be used for the present occasion and only once.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-12205 at a Glance

CVE Identifier CVE-2026-12205
GHSA Identifier GHSA-88g7-87jg-w4q9
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-323: Reusing a Nonce, Key Pair in Encryption
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:H/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 High (I:H)
Availability None (A:N)

How to Fix CVE-2026-12205

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-2026-12205, 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-323: Reusing a Nonce, Key Pair in Encryption, where nonces should be used for the present occasion and only once. 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::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery. Crypt::DSA::sign caches the per-signature nonce material in the Key object without ever clearing it. The first sign() on a Key object picks a nonce, and every later sign() on that same object reuses it, producing an identical "r". Keys used to sign more than once with an affected version should be considered compromised.

References

NVD — CVE-2026-12205 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12205
metacpan.org/release/timlegge/cr... WEB
https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/source/lib/Crypt/DSA.pm#L47
metacpan.org/release/timlegge/cr... WEB
https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/changes
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/06/15/4

Frequently Asked Questions

What is CVE-2026-12205?
CVE-2026-12205 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-323: Reusing a Nonce, Key Pair in Encryption.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-12205?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-12205?
CVE-2026-12205 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-12205?
CVE-2026-12205 is classified under CWE-323: Reusing a Nonce, Key Pair in Encryption (Nonces should be used for the present occasion and only once.).
How can I check Maven dependencies for CVE-2026-12205?
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-88g7-87jg-w4q9",
  "modified" : "2026-06-16T18:32:34Z",
  "published" : "2026-06-16T00:34:24Z",
  "aliases" : [ "CVE-2026-12205" ],
  "details" : "Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery.\n\nCrypt::DSA::sign caches the per-signature nonce material in the Key object without ever clearing it.\n\nThe first sign() on a Key object picks a nonce, and every later sign() on that same object reuses it, producing an identical \"r\".\n\nKeys used to sign more than once with an affected version should be considered compromised.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-12205"
  }, {
    "type" : "WEB",
    "url" : "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/source/lib/Crypt/DSA.pm#L47"
  }, {
    "type" : "WEB",
    "url" : "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/changes"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/06/15/4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-323" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-15T23:16:43Z"
  }
}