UBUNTU-CVE-2026-14570 (CVE-2026-14570)
Vulnerability from osv_ubuntu – Published: 2026-07-05 02:17 – Updated: 2026-07-09 15:15 – Source website
VLAI
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. "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.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcrypt-dsa-perl",
"binary_version": "1.17-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "libcrypt-dsa-perl",
"purl": "pkg:deb/ubuntu/libcrypt-dsa-perl@1.17-4?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.17-3",
"1.17-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcrypt-dsa-perl",
"binary_version": "1.17-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "libcrypt-dsa-perl",
"purl": "pkg:deb/ubuntu/libcrypt-dsa-perl@1.17-4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.17-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcrypt-dsa-perl",
"binary_version": "1.17-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "libcrypt-dsa-perl",
"purl": "pkg:deb/ubuntu/libcrypt-dsa-perl@1.17-4?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.17-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcrypt-dsa-perl",
"binary_version": "1.17-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libcrypt-dsa-perl",
"purl": "pkg:deb/ubuntu/libcrypt-dsa-perl@1.17-4?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.17-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcrypt-dsa-perl",
"binary_version": "1.17-5"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libcrypt-dsa-perl",
"purl": "pkg:deb/ubuntu/libcrypt-dsa-perl@1.17-5?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.17-5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcrypt-dsa-perl",
"binary_version": "1.19-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "libcrypt-dsa-perl",
"purl": "pkg:deb/ubuntu/libcrypt-dsa-perl@1.19-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.19-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcrypt-dsa-perl",
"binary_version": "1.19-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libcrypt-dsa-perl",
"purl": "pkg:deb/ubuntu/libcrypt-dsa-perl@1.19-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.19-1"
]
}
],
"aliases": [],
"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. \"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.",
"id": "UBUNTU-CVE-2026-14570",
"modified": "2026-07-09T15:15:46Z",
"published": "2026-07-05T02:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-14570"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-14570"
},
{
"type": "REPORT",
"url": "https://lists.security.metacpan.org/cve-announce/msg/41542402/"
},
{
"type": "REPORT",
"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/source/lib/Crypt/DSA/Util.pm#L56"
},
{
"type": "REPORT",
"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/changes"
},
{
"type": "REPORT",
"url": "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/diff/TIMLEGGE/Crypt-DSA-1.21#lib/Crypt/DSA/Util.pm"
},
{
"type": "REPORT",
"url": "http://www.openwall.com/lists/oss-security/2026/07/05/1"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-14570"
]
}
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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