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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 18 Mar 2026 19:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*

Fri, 13 Mar 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1392
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

threat_severity

Important


Wed, 11 Mar 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 11 Mar 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Istio
Istio istio
Vendors & Products Istio
Istio istio

Tue, 10 Mar 2026 22:15:00 +0000

Type Values Removed Values Added
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.
Title Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.
Weaknesses CWE-200
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-11T15:58:29.647Z

Reserved: 2026-03-09T17:41:56.078Z

Link: CVE-2026-31837

cve-icon Vulnrichment

Updated: 2026-03-11T15:53:26.857Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-10T22:16:21.720

Modified: 2026-03-18T18:59:40.970

Link: CVE-2026-31837

cve-icon Redhat

Severity : Important

Publid Date: 2026-03-10T21:57:44Z

Links: CVE-2026-31837 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-11T11:39:09Z

Weaknesses