GHSA-V6RC-95XW-8XP5
Vulnerability from github – Published: 2026-07-05 03:32 – Updated: 2026-07-06 15:30Crypt::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": [],
"aliases": [
"CVE-2026-14570"
],
"database_specific": {
"cwe_ids": [
"CWE-330"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-05T02:17:40Z",
"severity": "HIGH"
},
"details": "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.\n\n\"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.\"\n\nAn 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.\n\nKeys used to sign with an affected version should be considered compromised and new keys should be generated.",
"id": "GHSA-v6rc-95xw-8xp5",
"modified": "2026-07-06T15:30:46Z",
"published": "2026-07-05T03:32:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14570"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/source/lib/Crypt/DSA/Util.pm#L56"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/changes"
},
{
"type": "WEB",
"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/diff/TIMLEGGE/Crypt-DSA-1.21#lib/Crypt/DSA/Util.pm"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2026/07/05/1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
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