{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-16T17:37:57Z",
  "bugzilla" : {
    "description" : "authlib: Authlib: Information disclosure due to cryptographic padding oracle in JWE RSA1_5",
    "id" : "2448162",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2448162"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.9",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
    "status" : "draft"
  },
  "cwe" : "CWE-325",
  "details" : [ "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.", "A flaw was found in Authlib, a Python library for building OAuth and OpenID Connect servers. This cryptographic padding oracle vulnerability, affecting the JSON Web Encryption (JWE) RSA1_5 key management algorithm, could allow a remote attacker to decrypt sensitive information. The vulnerability arises because Authlib registers RSA1_5 without requiring explicit opt-in and bypasses constant-time Bleichenbacher mitigations in the underlying cryptography library." ],
  "statement" : "This MODERATE vulnerability in Authlib exposes a Bleichenbacher padding oracle in the JWE RSA1_5 implementation. Authlib enables RSA1_5 by default and breaks constant-time protections from the cryptography library. Remote attackers can exploit timing side-channels to decrypt encrypted tokens. Exploitation requires high complexity but no authentication. Impact is high confidentiality loss. Affects versions prior to 1.6.9.",
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    "fix_state" : "Not affected",
    "package_name" : "lightspeed-core/lightspeed-stack-rhel9",
    "cpe" : "cpe:/a:redhat:lightspeed_core"
  }, {
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    "fix_state" : "Fix deferred",
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    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
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    "fix_state" : "Fix deferred",
    "package_name" : "ansible-automation-platform-26/lightspeed-chatbot-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
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    "fix_state" : "Fix deferred",
    "package_name" : "rhoai/odh-mlflow-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
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    "package_name" : "rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9",
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  }, {
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  }, {
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  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
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  }, {
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  }, {
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  }, {
    "product_name" : "Red Hat Quay 3",
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  }, {
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  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-28490\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-28490\nhttps://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22\nhttps://github.com/authlib/authlib/releases/tag/v1.6.9\nhttps://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78" ],
  "name" : "CVE-2026-28490",
  "csaw" : false
}