Critical
ruby-jwt — security advisory
ruby-jwt v3.0.0.beta1 was discovered to contain weak encryption. NOTE: the Supplier's perspective is "keysize is not something that is enforced by this library. Currently more recent versions of OpenSSL are enforcing some key sizes and those restrictions apply to the users of this gem also."
- Products
- ruby-jwt
- Affected versions
- 1.0.0-3, 1.5.6-1, 2.1.0-2, 2.2.2-1, 2.7.0-2, 2.7.1-1, 3.2.0-1
- Fixed versions
- Not specified
- CVEs
- CVE-2025-45765
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:28 UTC · Revision 1
Source evidence
ruby-jwt v3.0.0.beta1 was discovered to contain weak encryption. NOTE: the Supplier's perspective is "keysize is not something that is enforced by this library. Currently more recent versions of OpenSSL are enforcing some key sizes and those restrictions apply to the users of this gem also."
osv:UBUNTU-CVE-2025-45765
ruby-jwt
Fixed versions: Not specified
ruby-jwt
Fixed versions: Not specified
ruby-jwt
Fixed versions: Not specified
ruby-jwt
Fixed versions: Not specified
ruby-jwt
Fixed versions: Not specified
ruby-jwt
Fixed versions: Not specified
ruby-jwt
Fixed versions: Not specified
ruby-jwt
Fixed versions: Not specified
Complete source record
{
"id": "9b6dd3750485075b77bf95f8567961aeb3573888190285cd902d334e1142374f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-45765",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-45765",
"summary": "ruby-jwt v3.0.0.beta1 was discovered to contain weak encryption. NOTE: the Supplier's perspective is \"keysize is not something that is enforced by this library. Currently more recent versions of OpenSSL are enforcing some key sizes and those restrictions apply to the users of this gem also.\"",
"evidence": "osv:UBUNTU-CVE-2025-45765",
"products": [
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}
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{
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],
"severity": "critical",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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"events": [
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"versions": [
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"database_specific": {
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},
"ecosystem_specific": {
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}
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/ruby-jwt?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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"database_specific": {
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"ecosystem": "Ubuntu:22.04:LTS"
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},
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],
"modified": "2026-10-17T12:56:51.799435297Z",
"provider": "osv",
"upstream": [
"CVE-2025-45765"
],
"references": [
"https://ubuntu.com/security/CVE-2025-45765",
"https://www.cve.org/CVERecord?id=CVE-2025-45765",
"https://gist.github.com/ZupeiNie/c621253068ce5b64911629534879e8f9",
"https://github.com/jwt/ruby-jwt/issues/668"
]
},
"related_cves": [
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"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356476,
"published_at": "2025-08-07T21:15:00+00:00"
}