Medium
pyjwt — security advisory
PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN markers without a matching END marker. As a result, is_pem_format performs unbounded backtracking while searching for a PEM end marker. Consequently, an attacker can cause intensive CPU consumption. This issue is fixed in version 2.14.0.
- 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, 1.3.0-1ubuntu0.1+esm4, 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, 1.5.3+ds1-1ubuntu0.1+esm4, 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, 1.7.1-2ubuntu2.1+esm4, 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, 2.10.1-4ubuntu1.3, 2.12.1-1, 2.13.0-1, 2.13.0-1ubuntu1, 2.13.0-1ubuntu1.1, 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, 2.3.0-1ubuntu0.6, 2.7.0-1, 2.7.0-1ubuntu0.1, 2.7.0-1ubuntu0.2, 2.7.0-1ubuntu0.3, 2.7.0-1ubuntu0.4
- Fixed versions
- Not specified
- CVEs
- CVE-2026-102270
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 09:37 UTC · Revision 1
Source evidence
PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN markers without a matching END marker. As a result, is_pem_format performs unbounded backtracking while searching for a PEM end marker. Consequently, an attacker can cause intensive CPU consumption. This issue is fixed in version 2.14.0.
osv:UBUNTU-CVE-2026-102270
pyjwt
Fixed versions: Not specified
pyjwt
Fixed versions: Not specified
pyjwt
Fixed versions: Not specified
pyjwt
Fixed versions: Not specified
pyjwt
Fixed versions: Not specified
pyjwt
Fixed versions: Not specified
pyjwt
Fixed versions: Not specified
Complete source record
{
"id": "0ef315e540876013573a919c6cf2de9b444f19420bd8ff6b29589f48e65b73c9",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-102270",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-102270",
"summary": "PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN markers without a matching END marker. As a result, is_pem_format performs unbounded backtracking while searching for a PEM end marker. Consequently, an attacker can cause intensive CPU consumption. This issue is fixed in version 2.14.0.",
"evidence": "osv:UBUNTU-CVE-2026-102270",
"products": [
{
"name": {
"value": "pyjwt",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"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"
},
{
"value": "1.3.0-1ubuntu0.1+esm4",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
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{
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"evidence": "/affected/1/versions"
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{
"value": "1.5.3+ds1-1",
"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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{
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"evidence": "/affected/2/versions"
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{
"value": "1.7.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.1-2ubuntu1",
"evidence": "/affected/2/versions"
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{
"value": "1.7.1-2ubuntu2",
"evidence": "/affected/2/versions"
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/3/versions"
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{
"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"
},
{
"value": "2.3.0-1ubuntu0.6",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"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"
},
{
"value": "2.7.0-1ubuntu0.4",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "pyjwt",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"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"
},
{
"value": "2.13.0-1ubuntu1.1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "pyjwt",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"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"
},
{
"value": "2.10.1-4ubuntu1.3",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-102270",
"aliases": [
"UBUNTU-CVE-2026-102270"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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{
"type": "ECOSYSTEM",
"events": [
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"introduced": "0"
}
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],
"package": {
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"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",
"1.3.0-1ubuntu0.1+esm4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102270.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"
}
]
}
},
{
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}
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}
],
"package": {
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"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",
"1.5.3+ds1-1ubuntu0.1+esm4"
],
"database_specific": {
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{
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},
"versions": [
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"1.7.1-1",
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"1.7.1-2ubuntu2.1",
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"1.7.1-2ubuntu2.1+esm2",
"1.7.1-2ubuntu2.1+esm3",
"1.7.1-2ubuntu2.1+esm4"
],
"database_specific": {
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},
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"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
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"2.1.0-1",
"2.3.0-1",
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"2.3.0-1ubuntu0.3",
"2.3.0-1ubuntu0.4",
"2.3.0-1ubuntu0.5",
"2.3.0-1ubuntu0.6"
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"database_specific": {
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},
"ecosystem_specific": {
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}
},
{
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],
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"ecosystem": "Ubuntu:24.04:LTS"
},
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],
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},
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"ecosystem": "Ubuntu:26.10"
},
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"2.10.1-4ubuntu1",
"2.12.1-1",
"2.13.0-1",
"2.13.0-1ubuntu1",
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],
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},
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{
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}
]
}
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"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",
"2.10.1-4ubuntu1.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102270.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.10.1-4ubuntu1.3"
}
]
}
}
],
"modified": "2026-10-20T10:45:28.297804636Z",
"provider": "osv",
"upstream": [
"CVE-2026-102270"
],
"references": [
"https://ubuntu.com/security/CVE-2026-102270",
"https://www.cve.org/CVERecord?id=CVE-2026-102270",
"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-jwrc-g2q2-pq5p",
"https://github.com/jpadilla/pyjwt/commit/8b4e233a22206b34ec1186e912e75c0b2396ac07",
"https://github.com/jpadilla/pyjwt/releases/tag/2.14.0"
]
},
"related_cves": [
{
"value": "CVE-2026-102270",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 379287,
"published_at": "2026-09-28T21:17:00+00:00"
}