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

Vulnerability from cvelistv5 – Published: 2026-03-10 21:57 – Updated: 2026-06-30 12:07
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.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-1392 - Use of Default Credentials
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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Red Hat Red Hat OpenShift AI 2.25     cpe:/a:redhat:openshift_ai:2.25::el9
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Red Hat Red Hat OpenShift Service Mesh 3.0     cpe:/a:redhat:service_mesh:3.0::el9
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Red Hat Red Hat OpenShift Service Mesh 3.1     cpe:/a:redhat:service_mesh:3.1::el9
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Red Hat Red Hat OpenShift Service Mesh 3.2     cpe:/a:redhat:service_mesh:3.2::el9
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Red Hat cert-manager Operator for Red Hat OpenShift     cpe:/a:redhat:cert_manager:1
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Red Hat OpenShift Serverless     cpe:/a:redhat:serverless:1
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat ExternalDNS Operator     cpe:/a:redhat:ext_dns_optr:1
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Red Hat OpenShift Service Mesh 2     cpe:/a:redhat:service_mesh:2
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Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat Connectivity Link 1     cpe:/a:redhat:connectivity_link:1
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Show details on NVD website

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    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.\", \"source\": {\"advisory\": \"GHSA-v75c-crr9-733c\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"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\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"istio\", \"product\": \"istio\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 1.29.0-alpha.0, \u003c 1.29.1\"}, {\"status\": \"affected\", \"version\": \"\u003e= 1.28.0-alpha.0, \u003c 1.28.5\"}, {\"status\": \"affected\", \"version\": \"\u003c 1.27.8\"}]}], \"references\": [{\"url\": \"https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c\", \"name\": \"https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-200\", \"description\": \"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-10T21:57:44.387Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-31837\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-11T15:53:25.811841Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-03-11T15:53:26.857Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31837\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-10T21:57:44.387Z\", \"dateReserved\": \"2026-03-09T17:41:56.078Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-03-10T21:57:44.387Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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