Vulnerability · Published Jul 5, 2026 · Assigned by CPANSec
CVE-2026-14570Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery
High 7.5
In plain English
A high-severity weak randomness in Crypt::DSA from TIMLEGGE. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Official description
Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery. "Crypt::DSA::Util::makerandom forces the high bit of every value it returns to obtain an exactly N-bit integer for prime search. The signing nonce and the private key are drawn from makerandom. Because the high bit is always set, the result is not uniform: its top bit is fixed, producing insecure values." An attacker who collects a modest number of signatures under an affected key, together with the public key, can recover the private key with a lattice attack. Keys used to sign with an affected version should be considered compromised and new keys should be generated.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libcrypt-dsa-perl | no fix listed | DEBIAN-CVE-2026-14570 |
| Debian:13 | libcrypt-dsa-perl | no fix listed | DEBIAN-CVE-2026-14570 |
| Ubuntu:22.04:LTS | libcrypt-dsa-perl | no fix listed | UBUNTU-CVE-2026-14570 |
| Ubuntu:24.04:LTS | libcrypt-dsa-perl | no fix listed | UBUNTU-CVE-2026-14570 |
| Ubuntu:25.10 | libcrypt-dsa-perl | no fix listed | UBUNTU-CVE-2026-14570 |
| Ubuntu:26.04:LTS | libcrypt-dsa-perl | no fix listed | UBUNTU-CVE-2026-14570 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TIMLEGGE | Crypt::DSA | 0 – before 1.22 |
Weakness: CWE-330 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/source/lib/Crypt/DSA/Util.pm#L56
- https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/diff/TIMLEGGE/Crypt-DSA-1.21#lib/Crypt/DSA/Util.pm
- https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/changes release-notes
- http://www.openwall.com/lists/oss-security/2026/07/05/1