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vuln-cve/data/2026/28xxx/CVE-2026-28490.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-28490",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-02-27T20:57:47.707Z",
"datePublished": "2026-03-16T17:37:57.425Z",
"dateUpdated": "2026-03-16T18:17:35.003Z"
},
"containers": {
"cna": {
"title": "Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-203",
"lang": "en",
"description": "CWE-203: Observable Discrepancy",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-327",
"lang": "en",
"description": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "LOW",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
}
}
],
"references": [
{
"name": "https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78"
},
{
"name": "https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22"
},
{
"name": "https://github.com/authlib/authlib/releases/tag/v1.6.9",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/authlib/authlib/releases/tag/v1.6.9"
}
],
"affected": [
{
"vendor": "authlib",
"product": "authlib",
"versions": [
{
"version": "< 1.6.9",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-03-16T17:37:57.425Z"
},
"descriptions": [
{
"lang": "en",
"value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9."
}
],
"source": {
"advisory": "GHSA-7432-952r-cw78",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-03-16T18:17:04.968931Z",
"id": "CVE-2026-28490",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-03-16T18:17:35.003Z"
}
}
]
}
}