HighFix available
pyjwt — security advisory
PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.
- Products
- pyjwt
- Affected versions
- 1.0.0-0ubuntu1, 1.3.0-1, 1.3.0-1ubuntu0.1, 1.3.0-1ubuntu0.1+esm1, 1.3.0-1ubuntu0.1+esm2, 1.3.0-1ubuntu0.1+esm3, 1.4.2-1.1, 1.5.3+ds1-1, 1.5.3+ds1-1ubuntu0.1, 1.5.3+ds1-1ubuntu0.1+esm1, 1.5.3+ds1-1ubuntu0.1+esm2, 1.5.3+ds1-1ubuntu0.1+esm3, 1.7.0-2, 1.7.1-1, 1.7.1-2ubuntu1, 1.7.1-2ubuntu2, 1.7.1-2ubuntu2.1, 1.7.1-2ubuntu2.1+esm1, 1.7.1-2ubuntu2.1+esm2, 1.7.1-2ubuntu2.1+esm3, 2.1.0-1, 2.10.1-2, 2.10.1-3, 2.10.1-3build1, 2.10.1-4, 2.10.1-4ubuntu1, 2.10.1-4ubuntu1.1, 2.10.1-4ubuntu1.2, 2.12.1-1, 2.13.0-1, 2.13.0-1ubuntu1, 2.3.0-1, 2.3.0-1ubuntu0.1, 2.3.0-1ubuntu0.2, 2.3.0-1ubuntu0.3, 2.3.0-1ubuntu0.4, 2.3.0-1ubuntu0.5, 2.7.0-1, 2.7.0-1ubuntu0.1, 2.7.0-1ubuntu0.2, 2.7.0-1ubuntu0.3
- Fixed versions
- 1.3.0-1ubuntu0.1+esm4, 1.5.3+ds1-1ubuntu0.1+esm4, 1.7.1-2ubuntu2.1+esm4, 2.10.1-4ubuntu1.3, 2.13.0-1ubuntu1.1, 2.3.0-1ubuntu0.6, 2.7.0-1ubuntu0.4
- CVEs
- CVE-2026-101918
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:54 UTC · Revision 1
Source evidence
PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.
osv:UBUNTU-CVE-2026-101918
pyjwt
Fixed versions: 1.3.0-1ubuntu0.1+esm4
pyjwt
Fixed versions: 1.5.3+ds1-1ubuntu0.1+esm4
pyjwt
Fixed versions: 1.7.1-2ubuntu2.1+esm4
pyjwt
Fixed versions: 2.3.0-1ubuntu0.6
pyjwt
Fixed versions: 2.7.0-1ubuntu0.4
pyjwt
Fixed versions: 2.13.0-1ubuntu1.1
pyjwt
Fixed versions: 2.10.1-4ubuntu1.3
Complete source record
{
"id": "dbd6aa1d3e4fc6c842e33f95e454f522b9334a2c9ff77bfa07f29ea321f32713",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-101918",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-101918",
"summary": "PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.",
"evidence": "osv:UBUNTU-CVE-2026-101918",
"products": [
{
"name": {
"value": "pyjwt",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.3.0-1ubuntu0.1+esm4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1.0.0-0ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0-1ubuntu0.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0-1ubuntu0.1+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0-1ubuntu0.1+esm2",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.0-1ubuntu0.1+esm3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "pyjwt",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.5.3+ds1-1ubuntu0.1+esm4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.4.2-1.1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.3+ds1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.3+ds1-1ubuntu0.1",
"evidence": "/affected/1/versions"
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{
"value": "1.5.3+ds1-1ubuntu0.1+esm1",
"evidence": "/affected/1/versions"
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{
"value": "1.5.3+ds1-1ubuntu0.1+esm2",
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{
"value": "1.5.3+ds1-1ubuntu0.1+esm3",
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},
{
"name": {
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},
"prerequisites": [],
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{
"value": "1.7.1-2ubuntu2.1+esm4",
"evidence": "/affected/2/ranges"
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],
"affected_versions": [
{
"value": "1.7.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.1-1",
"evidence": "/affected/2/versions"
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{
"value": "1.7.1-2ubuntu1",
"evidence": "/affected/2/versions"
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{
"value": "1.7.1-2ubuntu2",
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{
"value": "1.7.1-2ubuntu2.1",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.1-2ubuntu2.1+esm1",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.1-2ubuntu2.1+esm2",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.1-2ubuntu2.1+esm3",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "pyjwt",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.0-1ubuntu0.6",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "1.7.1-2ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "2.1.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.0-1ubuntu0.1",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.0-1ubuntu0.2",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.0-1ubuntu0.3",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.0-1ubuntu0.4",
"evidence": "/affected/3/versions"
},
{
"value": "2.3.0-1ubuntu0.5",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "pyjwt",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.0-1ubuntu0.4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "2.7.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-1ubuntu0.1",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-1ubuntu0.2",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-1ubuntu0.3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "pyjwt",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.13.0-1ubuntu1.1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "2.10.1-4ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "2.12.1-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.13.0-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.13.0-1ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "pyjwt",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.10.1-4ubuntu1.3",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "2.10.1-2",
"evidence": "/affected/6/versions"
},
{
"value": "2.10.1-3",
"evidence": "/affected/6/versions"
},
{
"value": "2.10.1-3build1",
"evidence": "/affected/6/versions"
},
{
"value": "2.10.1-4",
"evidence": "/affected/6/versions"
},
{
"value": "2.10.1-4ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2.10.1-4ubuntu1.1",
"evidence": "/affected/6/versions"
},
{
"value": "2.10.1-4ubuntu1.2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-101918",
"aliases": [
"UBUNTU-CVE-2026-101918"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.0-1ubuntu0.1+esm4"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1.0.0-0ubuntu1",
"1.3.0-1",
"1.3.0-1ubuntu0.1",
"1.3.0-1ubuntu0.1+esm1",
"1.3.0-1ubuntu0.1+esm2",
"1.3.0-1ubuntu0.1+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101918.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-jwt",
"binary_version": "1.3.0-1ubuntu0.1+esm4"
},
{
"binary_name": "python3-jwt",
"binary_version": "1.3.0-1ubuntu0.1+esm4"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.3+ds1-1ubuntu0.1+esm4"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.4.2-1.1",
"1.5.3+ds1-1",
"1.5.3+ds1-1ubuntu0.1",
"1.5.3+ds1-1ubuntu0.1+esm1",
"1.5.3+ds1-1ubuntu0.1+esm2",
"1.5.3+ds1-1ubuntu0.1+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101918.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-jwt",
"binary_version": "1.5.3+ds1-1ubuntu0.1+esm4"
},
{
"binary_name": "python3-jwt",
"binary_version": "1.5.3+ds1-1ubuntu0.1+esm4"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.1-2ubuntu2.1+esm4"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.7.0-2",
"1.7.1-1",
"1.7.1-2ubuntu1",
"1.7.1-2ubuntu2",
"1.7.1-2ubuntu2.1",
"1.7.1-2ubuntu2.1+esm1",
"1.7.1-2ubuntu2.1+esm2",
"1.7.1-2ubuntu2.1+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101918.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "1.7.1-2ubuntu2.1+esm4"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.0-1ubuntu0.6"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.7.1-2ubuntu2",
"2.1.0-1",
"2.3.0-1",
"2.3.0-1ubuntu0.1",
"2.3.0-1ubuntu0.2",
"2.3.0-1ubuntu0.3",
"2.3.0-1ubuntu0.4",
"2.3.0-1ubuntu0.5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101918.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.3.0-1ubuntu0.6"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.0-1ubuntu0.4"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2.7.0-1",
"2.7.0-1ubuntu0.1",
"2.7.0-1ubuntu0.2",
"2.7.0-1ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101918.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.7.0-1ubuntu0.4"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.13.0-1ubuntu1.1"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"2.10.1-4ubuntu1",
"2.12.1-1",
"2.13.0-1",
"2.13.0-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101918.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.13.0-1ubuntu1.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.10.1-4ubuntu1.3"
}
]
}
],
"package": {
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2.10.1-2",
"2.10.1-3",
"2.10.1-3build1",
"2.10.1-4",
"2.10.1-4ubuntu1",
"2.10.1-4ubuntu1.1",
"2.10.1-4ubuntu1.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-101918.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.10.1-4ubuntu1.3"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-27T11:45:03.805706168Z",
"provider": "osv",
"upstream": [
"CVE-2026-101918"
],
"references": [
"https://ubuntu.com/security/CVE-2026-101918",
"https://www.cve.org/CVERecord?id=CVE-2026-101918",
"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-42vr-xj54-vc7v",
"https://github.com/jpadilla/pyjwt/commit/5fde08a6cf906aa7698de2d6391d88b73006b17b",
"https://github.com/jpadilla/pyjwt/releases/tag/2.15.0",
"https://ubuntu.com/security/notices/USN-8934-1"
]
},
"related_cves": [
{
"value": "CVE-2026-101918",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 461459,
"published_at": "2026-09-28T21:17:00+00:00"
}