CVE-2026-12205 Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery
Reusing nonces in Crypt::DSA allows private key recovery, compromising all keys signed with affected versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12205?
CVE-2026-12205 is a critical vulnerability in TIMLEGGE Crypt::DSA, published on 15 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-323
Which versions are affected by CVE-2026-12205?
How do I fix CVE-2026-12205?
No fix has been published for CVE-2026-12205 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-12205 being exploited?
There is no known exploitation of CVE-2026-12205 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-12205, GHSA-88g7-87jg-w4q9, UBUNTU-CVE-2026-12205.