CVE•Published 2026-03-10•Modified 2026-07-20•0 articles on news•3 live references•NVD data

CVE-2026-31837Istio · Istio

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS percentile

Exploit Prediction Scoring System · top 70% of all CVEs

Weaknesses (CWE)

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

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.

Timeline

Published 2026-03-10

Modified 2026-07-20

External references

NVD MITRE VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-31837

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Istio Istio"

All exposed Istio Istio instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Istio"

HTTP body or banner mentions "Istio" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-31837