pyjwt vulnerabilities
It was discovered that PyJWT incorrectly handled certain URIs when using PyJWKClient. A remote attacker could possibly use this issue to perform server-side request forgery (SSRF) or expose sensitive local files. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-48522) It was discovered that PyJWT incorrectly verified cryptographic signatures when decoding tokens with PyJWK keys. A remote attacker could possibly use this issue to bypass signature verification and forge valid JSON Web Tokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-48523) It was discovered that PyJWT incorrectly handled unknown key identifiers in PyJWKClient. A remote attacker could possibly use this issue to cause PyJWT to make excessive network requests, resulting in a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-48524) It was discovered that PyJWT incorrectly handled payload decoding during detached JWS token verification. A remote attacker could possibly use this issue to cause PyJWT to consume excessive resources, resulting in a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-48525) It was discovered that PyJWT incorrectly validated JSON Web Keys when decoding tokens with both HMAC and asymmetric algorithms enabled. A remote attacker could possibly use this issue to forge valid tokens, resulting in an authentication bypass. (CVE-2026-48526)
USN-8823-1
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:USN-8823-1
pyjwt
Source reference: /affected/0/package/name
- Affected versions
- 1.0.0-0ubuntu1
Source reference:
/affected/0/versions1.3.0-1Source reference:
/affected/0/versions1.3.0-1ubuntu0.1Source reference:
/affected/0/versions1.3.0-1ubuntu0.1+esm1Source reference:
/affected/0/versions - Fixed versions
- 1.3.0-1ubuntu0.1+esm2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
pyjwt
Source reference: /affected/1/package/name
- Affected versions
- 1.4.2-1.1
Source reference:
/affected/1/versions1.5.3+ds1-1Source reference:
/affected/1/versions1.5.3+ds1-1ubuntu0.1Source reference:
/affected/1/versions1.5.3+ds1-1ubuntu0.1+esm1Source reference:
/affected/1/versions - Fixed versions
- 1.5.3+ds1-1ubuntu0.1+esm2
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
pyjwt
Source reference: /affected/2/package/name
- Affected versions
- 1.7.0-2
Source reference:
/affected/2/versions1.7.1-1Source reference:
/affected/2/versions1.7.1-2ubuntu1Source reference:
/affected/2/versions1.7.1-2ubuntu2Source reference:
/affected/2/versions1.7.1-2ubuntu2.1Source reference:
/affected/2/versions1.7.1-2ubuntu2.1+esm1Source reference:
/affected/2/versions - Fixed versions
- 1.7.1-2ubuntu2.1+esm2
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
pyjwt
Source reference: /affected/3/package/name
- Affected versions
- 1.7.1-2ubuntu2
Source reference:
/affected/3/versions2.1.0-1Source reference:
/affected/3/versions2.3.0-1Source reference:
/affected/3/versions2.3.0-1ubuntu0.1Source reference:
/affected/3/versions2.3.0-1ubuntu0.2Source reference:
/affected/3/versions2.3.0-1ubuntu0.3Source reference:
/affected/3/versions - Fixed versions
- 2.3.0-1ubuntu0.4
Source reference:
/affected/3/ranges - Prerequisites
- Not stated in this record
pyjwt
Source reference: /affected/4/package/name
- Affected versions
- 2.7.0-1
Source reference:
/affected/4/versions2.7.0-1ubuntu0.1Source reference:
/affected/4/versions - Fixed versions
- 2.7.0-1ubuntu0.2
Source reference:
/affected/4/ranges - Prerequisites
- Not stated in this record
pyjwt
Source reference: /affected/5/package/name
- Affected versions
- 2.10.1-2
Source reference:
/affected/5/versions2.10.1-3Source reference:
/affected/5/versions2.10.1-3build1Source reference:
/affected/5/versions2.10.1-4Source reference:
/affected/5/versions2.10.1-4ubuntu1Source reference:
/affected/5/versions - Fixed versions
- 2.10.1-4ubuntu1.1
Source reference:
/affected/5/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.0-1ubuntu0.1+esm2"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-48526",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-jwt",
"binary_version": "1.3.0-1ubuntu0.1+esm2"
},
{
"binary_name": "python3-jwt",
"binary_version": "1.3.0-1ubuntu0.1+esm2"
}
],
"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+esm2"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-48526",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-jwt",
"binary_version": "1.5.3+ds1-1ubuntu0.1+esm2"
},
{
"binary_name": "python3-jwt",
"binary_version": "1.5.3+ds1-1ubuntu0.1+esm2"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.1-2ubuntu2.1+esm2"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-48526",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "1.7.1-2ubuntu2.1+esm2"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.0-1ubuntu0.4"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-48522",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48526",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.3.0-1ubuntu0.4"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.0-1ubuntu0.2"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-48522",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48524",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48525",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48526",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.7.0-1ubuntu0.2"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.10.1-4ubuntu1.1"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8823-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-48522",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48523",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48524",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48525",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-48526",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.10.1-4ubuntu1.1"
}
],
"availability": "No subscription required"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #22403 · Revision 1
- Added to Heist Feed
- Publisher date