CVE-2026-31837

Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.

State: Published
Severity: 8.7 High
Published: Mar 10, 2026
Updated: Jul 20, 2026
Reserved: Mar 9, 2026

Description

Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a user of Istio is impacted if the JWKS resolver becomes unavailable or the fetch fails, exposing hardcoded defaults regardless of use of the RequestAuthentication resource. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub_M
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	redhat-SADP

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-1392 Use of Default Credentials

Affected Products

Product	Versions
istioistio	>= 1.29.0-alpha.0, < 1.29.1Affected >= 1.28.0-alpha.0, < 1.28.5Affected < 1.27.8Affected

References

https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c
https://access.redhat.com/security/cve/CVE-2026-31837vdb-entry
RHBZ#2446344issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31837.json
https://access.redhat.com/errata/RHSA-2026:10184vendor-advisory
https://access.redhat.com/errata/RHSA-2026:5948vendor-advisory
https://access.redhat.com/errata/RHSA-2026:5950vendor-advisory
https://access.redhat.com/errata/RHSA-2026:5952vendor-advisory

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