CVE-2026-31837 (GCVE-0-2026-31837)
Vulnerability from cvelistv5 – Published: 2026-03-10 21:57 – Updated: 2026-07-20 12:04
VLAI
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-11 15:53 UTC
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/istio/istio/security/advisorie… | x_refsource_CONFIRM |
| https://access.redhat.com/security/cve/CVE-2026-31837 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2446344 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10184 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:5948 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:5950 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:5952 | vendor-advisoryx_refsource_REDHAT |
Impacted products
18 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| istio | istio |
Affected:
>= 1.29.0-alpha.0, < 1.29.1
Affected: >= 1.28.0-alpha.0, < 1.28.5 Affected: < 1.27.8 |
guessed | |
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776343082 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
||
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776343105 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
||
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776343121 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
||
| Red Hat | Red Hat OpenShift Service Mesh 3.0 |
Unaffected:
1774006090 , < *
(rpm)
cpe:/a:redhat:service_mesh:3.0::el9 |
||
| Red Hat | Red Hat OpenShift Service Mesh 3.0 |
Unaffected:
1774068855 , < *
(rpm)
cpe:/a:redhat:service_mesh:3.0::el9 |
||
| Red Hat | Red Hat OpenShift Service Mesh 3.1 |
Unaffected:
1774037369 , < *
(rpm)
cpe:/a:redhat:service_mesh:3.1::el9 |
||
| Red Hat | Red Hat OpenShift Service Mesh 3.1 |
Unaffected:
1774244136 , < *
(rpm)
cpe:/a:redhat:service_mesh:3.1::el9 |
||
| Red Hat | Red Hat OpenShift Service Mesh 3.2 |
Unaffected:
1774206464 , < *
(rpm)
cpe:/a:redhat:service_mesh:3.2::el9 |
||
| Red Hat | Red Hat OpenShift Service Mesh 3.2 |
Unaffected:
1774114903 , < *
(rpm)
cpe:/a:redhat:service_mesh:3.2::el9 |
||
| Red Hat | cert-manager Operator for Red Hat OpenShift |
cpe:/a:redhat:cert_manager:1
|
||
| Red Hat | ExternalDNS Operator |
cpe:/a:redhat:ext_dns_optr:1
|
||
| Red Hat | OpenShift Serverless |
cpe:/a:redhat:serverless:1
|
||
| Red Hat | OpenShift Service Mesh 2 |
cpe:/a:redhat:service_mesh:2
|
||
| Red Hat | OpenShift Service Mesh 3 |
cpe:/a:redhat:service_mesh:3
|
||
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
||
| Red Hat | Red Hat Connectivity Link 1 |
cpe:/a:redhat:connectivity_link:1
|
||
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai
|
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This vulnerability can lead to the exposure of hardcoded default settings, potentially bypassing authentication mechanisms and allowing unauthorized access.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1392\", \"description\": \"Use of Default Credentials\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-20T12:04:43.711Z\"}}, {\"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\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-11T15:53:26.857Z\"}}], \"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\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-31837\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-20T12:04:43.711Z\", \"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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