CVE-2026-28490

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Source
https://cve.org/CVERecord?id=CVE-2026-28490
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-28490.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-28490
Aliases
Downstream
Related
Published
2026-03-16T17:37:57Z
Modified
2026-08-12T03:30:34Z
Severity
  • 8.3 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle
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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-203",
        "CWE-327"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28490.json"
}
References

Affected packages

Git / github.com/authlib/authlib

Affected ranges

Type
GIT
Repo
https://github.com/authlib/authlib
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
9266eaa2227ad7e21dc731b2a4a01909aabd934b
Fixed
48b345f29f6c459f11c6a40162b6c0b742ef2e22
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.6.9"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.1
v0.10
v0.11
v0.12
v0.13
v0.14
v0.14.1
v0.14.2
v0.14.3
v0.15
v0.2
v0.2.1
v0.3
v0.4
v0.4.1
v0.5
v0.5.1
v0.6
v0.7
v0.8
v0.9
v1.*
v1.0.0
v1.0.1
v1.1.0
v1.2.0
v1.2.1
v1.3.0
v1.3.2
v1.4.0
v1.4.1
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.6.7
v1.6.8

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-28490.json"