USN-8823-1 (UBUNTU-CVE-2026-48522)
Vulnerability from osv_ubuntu – Published: 2026-09-25 07:49 – Updated: 2026-09-25 07:49 – Source website
VLAI
Summary
pyjwt vulnerabilities
Details
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)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-48526",
"severity": [
{
"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": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt@1.3.0-1ubuntu0.1+esm2?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.3.0-1ubuntu0.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.0-0ubuntu1",
"1.3.0-1",
"1.3.0-1ubuntu0.1",
"1.3.0-1ubuntu0.1+esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-48526",
"severity": [
{
"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": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt@1.5.3+ds1-1ubuntu0.1+esm2?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.3+ds1-1ubuntu0.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"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": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-48526",
"severity": [
{
"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": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "1.7.1-2ubuntu2.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt@1.7.1-2ubuntu2.1+esm2?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.1-2ubuntu2.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"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": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-48522",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48526",
"severity": [
{
"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": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.3.0-1ubuntu0.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt@2.3.0-1ubuntu0.4?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.0-1ubuntu0.4"
}
],
"type": "ECOSYSTEM"
}
],
"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": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-48522",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48524",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48525",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48526",
"severity": [
{
"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": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.7.0-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt@2.7.0-1ubuntu0.2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.0-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.7.0-1",
"2.7.0-1ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-48522",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48523",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48524",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48525",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-48526",
"severity": [
{
"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": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-jwt",
"binary_version": "2.10.1-4ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "pyjwt",
"purl": "pkg:deb/ubuntu/pyjwt@2.10.1-4ubuntu1.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.10.1-4ubuntu1.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.10.1-2",
"2.10.1-3",
"2.10.1-3build1",
"2.10.1-4",
"2.10.1-4ubuntu1"
]
}
],
"aliases": [],
"details": "It was discovered that PyJWT incorrectly handled certain URIs when using\nPyJWKClient. A remote attacker could possibly use this issue to perform\nserver-side request forgery (SSRF) or expose sensitive local files.\nThis issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu\n26.04 LTS. (CVE-2026-48522)\n\nIt was discovered that PyJWT incorrectly verified cryptographic signatures\nwhen decoding tokens with PyJWK keys. A remote attacker could possibly\nuse this issue to bypass signature verification and forge valid JSON Web\nTokens. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-48523)\n\nIt was discovered that PyJWT incorrectly handled unknown key identifiers\nin PyJWKClient. A remote attacker could possibly use this issue to cause\nPyJWT to make excessive network requests, resulting in a denial of service.\nThis issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.\n(CVE-2026-48524)\n\nIt was discovered that PyJWT incorrectly handled payload decoding during\ndetached JWS token verification. A remote attacker could possibly use\nthis issue to cause PyJWT to consume excessive resources, resulting in\na denial of service. This issue only affected Ubuntu 24.04 LTS and\nUbuntu 26.04 LTS. (CVE-2026-48525)\n\nIt was discovered that PyJWT incorrectly validated JSON Web Keys when\ndecoding tokens with both HMAC and asymmetric algorithms enabled. A remote\nattacker could possibly use this issue to forge valid tokens, resulting\nin an authentication bypass. (CVE-2026-48526)",
"id": "USN-8823-1",
"modified": "2026-09-25T07:49:33Z",
"published": "2026-09-25T07:49:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8823-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-48522"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-48523"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-48524"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-48525"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-48526"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "pyjwt vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-48522",
"UBUNTU-CVE-2026-48523",
"UBUNTU-CVE-2026-48524",
"UBUNTU-CVE-2026-48525",
"UBUNTU-CVE-2026-48526"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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