Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

CVE-2026-40946Oxia: OIDC token audience validation bypass via SkipClientIDCheck

Critical 9.2

In plain English

A critical-severity improper authentication in oxia from oxia-db. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.2Critical

Exploit odds (30 days)0.3%top 82.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Oxia is a metadata store and coordination system. Prior to 0.16.2, the OIDC authentication provider unconditionally sets SkipClientIDCheck: true in the go-oidc verifier configuration, disabling the standard audience (aud) claim validation at the library level. This allows tokens issued for unrelated services by the same OIDC issuer to be accepted by Oxia. This vulnerability is fixed in 0.16.2.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/oxia-db/oxia	0.16.2	GHSA-fhvp-9hcj-6m33
Go	github.com/oxia-db/oxia	0.16.2	GO-2026-5364

Affected products (as reported)

Vendor	Product	Versions
oxia-db	oxia	< 0.16.2

Weakness: CWE-287 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/oxia-db/oxia/security/advisories/GHSA-fhvp-9hcj-6m33 x_refsource_CONFIRM