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    CVE-2026-114616

    Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1.

    Published:Oct 22, 2026
    Last Modified:Oct 29, 2026
    EPS:Oct 22, 2026
    EPSS Score:0.00212
    CVSS Score:7.4

    Affected Products

    Vendor
    Authlib
    Product
    Authlib

    Exploits

    https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg

    Related CVEs

    CVE-2026-116672 (CVSS 8.8) — Authlib is a Python library which builds OAuth and OpenID Connect servers. From 0.15 until 1.9.1, the document…
    CVE-2026-114620 (CVSS 5.4) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC 9101 …
    CVE-2026-114619 (CVSS 4.6) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, OpenIDImplicitGrant…
    CVE-2026-114618 (CVSS 6.8) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 752…
    CVE-2026-114617 (CVSS 4.2) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, OpenIDMixin.parse_i…
    CVE-2026-114615 (CVSS 7.4) — Authlib is a Python library which builds OAuth and OpenID Connect servers. From 1.3.1 until 1.9.0, OctKey.impo…
    CVE-2026-114614 (CVSS 2.6) — Authlib is a Python library which builds OAuth and OpenID Connect servers. From 0.13 until 1.8.0, authlib.comm…
    CVE-2026-104056 (CVSS 9.8) — Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without valid…
    CVE-2026-96760 (CVSS 9.8) — Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deseri…
    CVE-2026-41479 (CVSS 5.4) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib'…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High