CVE-2026-31837

HIGH
2026-03-10 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Mar 10, 2026 - 22:16 nvd
HIGH 7.5

Tags

Information Disclosure Istio

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.

Analysis

Istio versions prior to 1.29.1, 1.28.5, and 1.27.8 fall back to hardcoded default JWKS values when the resolver becomes unavailable or fails to fetch, potentially allowing attackers to bypass authentication controls configured via RequestAuthentication policies. This flaw exposes sensitive information and could enable unauthorized access to microservices when JWKS endpoints are unreachable. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: 0

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CVE-2026-31837 vulnerability details – vuln.today
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