CriticalFix available
joserfc — security advisory
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.
- Products
- joserfc
- Affected versions
- 1.1.0-1, 1.2.0-1, 1.2.2-1, 1.3.1-1, 1.3.2-1, 1.3.4-1, 1.4.0-1, 1.4.1-1, 1.4.3-1, 1.5.0-1, 1.6.0-1, 1.6.1-1, 1.6.2-1, 1.6.3-1, 1.6.4-1, 1.6.5-1, 1.6.8-1, 1.7.0-1, 1.7.1-1, 1.7.2-1, 1.7.3-1, 1.7.4-1, 1.7.5-1
- Fixed versions
- 1.7.4-1
- CVEs
- CVE-2026-102946
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:47 UTC · Revision 1
Source evidence
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.
osv:DEBIAN-CVE-2026-102946
joserfc
Fixed versions: Not specified
joserfc
Fixed versions: 1.7.4-1
Complete source record
{
"id": "6fc862f80cfbf30397565c3613221e25d2efb38021d94ce2ee77286016003284",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-102946",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-102946",
"summary": "joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.",
"evidence": "osv:DEBIAN-CVE-2026-102946",
"products": [
{
"name": {
"value": "joserfc",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.1.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.2.2-1",
"evidence": "/affected/0/versions"
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{
"value": "1.3.1-1",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
"value": "1.3.4-1",
"evidence": "/affected/0/versions"
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{
"value": "1.4.0-1",
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{
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{
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"evidence": "/affected/0/versions"
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{
"value": "1.5.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.4-1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "1.6.8-1",
"evidence": "/affected/0/versions"
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{
"value": "1.7.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.7.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.7.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.7.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.7.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.7.5-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "joserfc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.7.4-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.1.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.2.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.2.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.4.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.4.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.4.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.8-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.3-1",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-102946",
"aliases": [
"DEBIAN-CVE-2026-102946"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "joserfc",
"purl": "pkg:deb/debian/joserfc?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.1.0-1",
"1.2.0-1",
"1.2.2-1",
"1.3.1-1",
"1.3.2-1",
"1.3.4-1",
"1.4.0-1",
"1.4.1-1",
"1.4.3-1",
"1.5.0-1",
"1.6.0-1",
"1.6.1-1",
"1.6.2-1",
"1.6.3-1",
"1.6.4-1",
"1.6.5-1",
"1.6.8-1",
"1.7.0-1",
"1.7.1-1",
"1.7.2-1",
"1.7.3-1",
"1.7.4-1",
"1.7.5-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-102946.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.4-1"
}
]
}
],
"package": {
"name": "joserfc",
"purl": "pkg:deb/debian/joserfc?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.1.0-1",
"1.2.0-1",
"1.2.2-1",
"1.3.1-1",
"1.3.2-1",
"1.3.4-1",
"1.4.0-1",
"1.4.1-1",
"1.4.3-1",
"1.5.0-1",
"1.6.0-1",
"1.6.1-1",
"1.6.2-1",
"1.6.3-1",
"1.6.4-1",
"1.6.5-1",
"1.6.8-1",
"1.7.0-1",
"1.7.1-1",
"1.7.2-1",
"1.7.3-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-102946.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-17T15:00:08.124237049Z",
"provider": "osv",
"upstream": [
"CVE-2026-102946"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-102946"
]
},
"related_cves": [
{
"value": "CVE-2026-102946",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 362234,
"published_at": "2026-10-15T19:17:13.423+00:00"
}