CVE-2026-12205

Summary

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.

Affected Software

Weaknesses

• CWE-323: CWE-323 Reusing a Nonce, Key Pair in Encryption

ADP Enrichment

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/06/15/4

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

References

• https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.20/source/lib/Crypt/DSA.pm#L47
• https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/changes

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