CVE catalog
CVE-2026-12205
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 c
- Severity
- Critical · CVSS 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.29% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libcrypt-dsa-perl | trixie | 1.19-1 | vulnerable |
| Debian | libcrypt-dsa-perl | bookworm | 1.17-5 | vulnerable |
| Cpe | libcrypt-dsa-perl | Not reported | Not reported | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 16.04 | 1.17-3 | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 16.04 | 1.17-4 | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 18.04 | 1.17-4 | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 20.04 | 1.17-4 | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 22.04 | 1.17-4 | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 24.04 | 1.17-5 | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 25.10 | 1.19-1 | vulnerable |
| Ubuntu | libcrypt-dsa-perl | 26.04 | 1.19-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libcrypt-dsa-perl | source | trixie | (unfixed) | not yet assigned | Not reported | [1140105] |
| Debian | libcrypt-dsa-perl | source | bookworm | (unfixed) | not yet assigned | Not reported | [1140105] |
Notes
[trixie] libcrypt-dsa-perl: Minor issue [bookworm] libcrypt-dsa-perl: Minor issue; sign() reuses cached nonce across signatures; obsolete leaf module, removed from sid
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libcrypt-dsa-perl]Affected
Details (2)
1.17-5· all · bookwormAffected
nvd · libcrypt-dsa-perl · debian · bookworm; nvd · libcrypt-dsa-perl · debian · 12
1.17-5· all · bookwormAffected
nvd · libcrypt-dsa-perl · debian · bookworm; nvd · libcrypt-dsa-perl · debian · 12
[Debian 13 (Trixie)]
- [libcrypt-dsa-perl]Affected
Details (2)
1.19-1· all · trixieAffected
nvd · libcrypt-dsa-perl · debian · 13
1.19-1· all · trixieAffected
nvd · libcrypt-dsa-perl · debian · 13
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/06/15/4]
- [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]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-12205]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-12205]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-12205]
- [https://security-tracker.debian.org/tracker/CVE-2026-12205]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12205.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]