CVE-2026-28490

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Source
https://cve.org/CVERecord?id=CVE-2026-28490
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28490.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-28490
Aliases
Downstream
Related
Published
2026-03-16T17:37:57.425Z
Modified
2026-04-21T08:11:01.017143574Z
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) RSA15 key management algorithm. Authlib registers RSA15 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",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28490.json",
    "cwe_ids": [
        "CWE-203",
        "CWE-327"
    ]
}
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

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/cve-osv-conversion/osv-output/CVE-2026-28490.json"

Git / github.com/lepture/authlib

Affected ranges

Type
GIT
Repo
https://github.com/lepture/authlib
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
9266eaa2227ad7e21dc731b2a4a01909aabd934b
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.6.9"
        }
    ]
}

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/cve-osv-conversion/osv-output/CVE-2026-28490.json"