CVE-2026-12205

NameCVE-2026-12205
DescriptionCrypt::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.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1140105

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libcrypt-dsa-perl (PTS)bullseye1.17-4vulnerable
bookworm1.17-5vulnerable
trixie1.19-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libcrypt-dsa-perlsource(unstable)1.21-11140105

Notes

[trixie] - libcrypt-dsa-perl <no-dsa> (Minor issue)
https://lists.security.metacpan.org/cve-announce/msg/41004653/

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