CVE-2026-31837

HIGHNVD 7.57.5
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5(low)
EPSS
29.8%
KEV
Not listed

Published

March 10, 2026

Last Modified

June 30, 2026

Advisory Details (8)

Auto-updated Jul 7, 2026
Patch available. Sources: github, redhat.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31837.json
redhat

2446344 – (CVE-2026-31837) CVE-2026-31837 istio: Istio: Information disclosure and authentication bypass via JWKS resolver unavailability

https://bugzilla.redhat.com/show_bug.cgi?id=2446344
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-31837
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:5952
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:5950
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:5948
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10184
github Patch Available

JWKS Resolver Failure May Expose Hardcoded Default Keys · Advisory · istio/istio · GitHub

https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c

Vendor Advisories for CVE-2026-31837(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhoai/odh-kserve-router-rhel9:17763431212026-04-23redhat
redhatopenshift-service-mesh/istio-proxyv2-rhel9:17740688552026-03-26redhat
redhatopenshift-service-mesh/istio-proxyv2-rhel9:17742441362026-03-26redhat
redhatopenshift-service-mesh/istio-proxyv2-rhel9:17741149032026-03-26redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 11× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-01 15:06 UTCEPSS rescore
  8. 2026-06-30 23:22 UTCEPSS rescore
  9. 2026-06-30 04:34 UTCEG score recompute
  10. 2026-06-30 04:34 UTCVendor advisory
  11. 2026-06-30 04:31 UTCNVD updatefirst tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-31837?
CVE-2026-31837 is a high vulnerability published on March 10, 2026. 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…
When was CVE-2026-31837 disclosed?
CVE-2026-31837 was first published in the National Vulnerability Database on March 10, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31837 actively exploited?
CVE-2026-31837 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-31837?
CVE-2026-31837 has a CVSS v3 base score of 7.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-31837?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31837, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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