CVE-2026-114615

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Source
https://cve.org/CVERecord?id=CVE-2026-114615
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-114615.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-114615
Aliases
Downstream
CGA (12)
CLEANSTART (1)
DEBIAN (1)
ECHO (1)
MINI (1)
openSUSE (1)
ROOT (1)
UBUNTU (1)
Related
Published
2026-10-22T21:10:02Z
Modified
2026-11-03T17:27:21Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
Authlib incomplete algorithm-confusion fix permits HMAC forgery with prefixed public keys
Details

Authlib is a Python library which builds OAuth and OpenID Connect servers. From 1.3.1 until 1.9.0, OctKey.import_key() checks asymmetric-key markers only at byte zero while Authlib's PEM loaders accept leading whitespace, comments, or a byte-order mark. In deployments that use the documented mixed algorithm registry and already configure verification with PEM or certificate bytes containing such a prefix, an unauthenticated attacker who knows those same public-key bytes can use them as an HMAC secret and forge HS256 tokens with arbitrary identity or authorization claims. This is a bypass of the remediation for CVE-2024-37568. The module-level jwt object reaches OctKey.import_key() in authlib/jose/rfc7518/oct_key.py, where POSSIBLE_UNSAFE_KEYS fails to identify prefixed asymmetric key material. This issue is fixed in version 1.9.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-184",
        "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114615.json"
}
References

Affected packages

Git / github.com/authlib/authlib

Affected ranges

Type
GIT
Repo
https://github.com/authlib/authlib
Events
Introduced
df226ab587c453029ef5083a7e1c5dc6772647dd
Fixed
e8d50bd7dc442fde1364291df9c429d1da91c0cb
Fixed
e3bd41cb29dcfee434453b135ffb487884baeedf
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.3.1"
                },
                {
                    "fixed": "1.9.0"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "range": [
                {
                    "fixed": "e3bd41cb29dcfee434453b135ffb487884baeedf"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v1.9.0",
            "range": [
                {
                    "fixed": "e8d50bd7dc442fde1364291df9c429d1da91c0cb"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-114615.json"