CVE-2026-31837 (GCVE-0-2026-31837)

Vulnerability from cvelistv5 – Published: 2026-03-10 21:57 – Updated: 2026-03-11 15:58
VLAI?
Title
Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.
Summary
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.
Severity ?
8.7 (High)
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
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Impacted products
Vendor Product Version
istio istio Affected: >= 1.29.0-alpha.0, < 1.29.1
Affected: >= 1.28.0-alpha.0, < 1.28.5
Affected: < 1.27.8
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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