TIMLEGGE Crypt::DSA up to 1.20 on Perl sign nonce re-use

Summaryinfo

A vulnerability classified as problematic was found in TIMLEGGE Crypt::DSA up to 1.20 on Perl. Affected by this vulnerability is the function sign. The manipulation results in nonce re-use. This vulnerability is identified as CVE-2026-12205. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in TIMLEGGE Crypt::DSA up to 1.20 on Perl. It has been classified as problematic. Affected is the function sign. The manipulation with an unknown input leads to a nonce re-use vulnerability. CWE is classifying the issue as CWE-323. Nonces should be used for the present occasion and only once. This is going to have an impact on integrity. CVE summarizes:

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.

The weakness was released by Richard Kettlewell. The advisory is available at metacpan.org. This vulnerability is traded as CVE-2026-12205 since 06/14/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 321125 (Linux Distros Unpatched Vulnerability : CVE-2026-12205), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.21 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (321125) and EUVD (EUVD-2026-37016). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• TIMLEGGE

Name

• Crypt::DSA

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20

CPE 2.3info

• 🔒
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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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