CVE-2026-31837 impacts Istio versions prior to 1.29.1, 1.28.5, and 1.27.8, where an unavailable or failed JWKS resolver can expose hardcoded defaults, bypassing the RequestAuthentication resource. This vulnerability is rated with a CVSS score of 7.5 (HIGH), indicating it is remotely exploitable with low complexity and can lead to high confidentiality impact. Despite the potential for sensitive information disclosure, there is currently no evidence of active exploitation, public exploit code, or significant community attention, with a very low EPSS score.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.27.8CPE matchmatch criteria | cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:* | ||
>= 1.28.0, < 1.28.5CPE matchmatch criteria | cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:* | ||
>= 1.29.0, < 1.29.1CPE matchmatch criteria | cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.