CVE-2026-114617

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Source
https://cve.org/CVERecord?id=CVE-2026-114617
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-114617.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-114617
Aliases
Downstream
CGA (12)
CLEANSTART (1)
DEBIAN (1)
ECHO (1)
MINI (1)
openSUSE (1)
UBUNTU (1)
Related
Published
2026-10-22T21:25:31Z
Modified
2026-11-03T17:27:21Z
Severity
  • 4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Authlib: ID token can disable its own nonce validation via the nonce_supported claim
Details

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, OpenIDMixin.parse_id_token() reads the nonce_supported decision from the untrusted ID token being validated and sets the expected nonce to null when that claim is the JSON boolean false. In implicit and hybrid relying parties, or applications that directly accept externally supplied ID tokens, an attacker with a captured validly signed token can bypass the nonce-to-session binding and replay the victim's token into an attacker-controlled session. Plain authorization code flow is not affected, and the token must still pass signature, issuer, and audience validation. OpenIDMixin.parse_id_token() trusts nonce_supported in both authlib/integrations/base_client/sync_openid.py and authlib/integrations/base_client/async_openid.py to disable the expected nonce. This issue is fixed in version 1.9.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-294",
        "CWE-807"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114617.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
e8d50bd7dc442fde1364291df9c429d1da91c0cb
Fixed
6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.9.0"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "range": [
                {
                    "fixed": "6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v1.9.0",
            "range": [
                {
                    "fixed": "e8d50bd7dc442fde1364291df9c429d1da91c0cb"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

1.*
1.7.1
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
v1.7.0
v1.7.1
v1.7.2
v1.8.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-114617.json"