{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-31838", "tracking": { "current_release_date": "2026-03-27T21:10:31.240438Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-31838", "initial_release_date": "2026-03-10T22:26:22.425826Z", "revision_history": [ { "date": "2026-03-10T22:26:22.425826Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-10T22:26:26.267033Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-10T22:38:40.012405Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (3).| References created (1).| CWES updated (1)." }, { "date": "2026-03-10T22:38:41.637980Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-11T14:39:28.167765Z", "number": "5", "summary": "Unknown change." }, { "date": "2026-03-11T14:39:34.673071Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-11T14:54:30.531232Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-12T12:16:24.791713Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| Products connected (5).| References created (4)." }, { "date": "2026-03-12T12:16:27.038242Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-13T00:27:50.717808Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (46).| Product Identifiers created (8).| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-13T00:28:06.357106Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-18T19:25:21.346678Z", "number": "12", "summary": "CVSS created.| Products connected (3).| Product Identifiers created (3)." }, { "date": "2026-03-18T19:25:23.712134Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:32:42.636438Z", "number": "14", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-27T09:06:35.291213Z", "number": "15", "summary": "Products connected (1).| References created (3)." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1", "product": { "name": "vers:rpm/1", "product_id": "CSAFPID-1441053", "product_identification_helper": { "cpe": "cpe:/a:redhat:cert_manager:1" } } } ], "category": "product_name", "name": "Cert-manager Operator For Red Hat Openshift" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1", "product": { "name": "vers:rpm/1", "product_id": "CSAFPID-5446213", "product_identification_helper": { "cpe": "cpe:/a:redhat:ext_dns_optr:1" } } } ], "category": "product_name", "name": "ExternalDNS Operator" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/1", "product": { "name": "vers:rpm/1", "product_id": "CSAFPID-1441076", 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"category": "product_version_range", "name": "vers:unknown/>=1.28.0-alpha.0|<1.28.5", "product": { "name": "vers:unknown/>=1.28.0-alpha.0|<1.28.5", "product_id": "CSAFPID-5779786" } }, { "category": "product_version_range", "name": "vers:unknown/>=1.28.0|<1.28.5", "product": { "name": "vers:unknown/>=1.28.0|<1.28.5", "product_id": "CSAFPID-5845003", "product_identification_helper": { "cpe": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=1.29.0-alpha.0|<1.29.1", "product": { "name": "vers:unknown/>=1.29.0-alpha.0|<1.29.1", "product_id": "CSAFPID-5779785" } }, { "category": "product_version_range", "name": "vers:unknown/>=1.29.0|<1.29.1", "product": { "name": "vers:unknown/>=1.29.0|<1.29.1", "product_id": "CSAFPID-5845004", "product_identification_helper": { "cpe": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Istio" } ], "category": "vendor", "name": "Istio" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-31838", "cwe": { "id": "CWE-863", "name": "Incorrect Authorization" }, "notes": [ { "category": "description", "text": "Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a vulnerability in Envoy RBAC header matching could allow authorization policy bypass when policies rely on HTTP headers that may contain multiple values. An attacker could craft requests with multiple header values in a way that causes Envoy to evaluate the header differently than intended, potentially bypassing authorization checks. This may allow unauthorized requests to reach protected services when policies depend on such header-based matching conditions. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-31838" }, { "category": "description", "text": "Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a vulnerability in Envoy RBAC header matching could allow authorization policy bypass when policies rely on HTTP headers that may contain multiple values. An attacker could craft requests with multiple header values in a way that causes Envoy to evaluate the header differently than intended, potentially bypassing authorization checks. This may allow unauthorized requests to reach protected services when policies depend on such header-based matching conditions. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-31838" }, { "category": "description", "text": "A flaw was found in Istio. This vulnerability in Envoy's Role-Based Access Control (RBAC) header matching could allow an attacker to bypass authorization policies. By crafting requests with multiple header values, an attacker could cause Envoy to misinterpret the header, leading to unauthorized access to protected services.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-31838" }, { "category": "other", "text": "0.00039", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/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", "title": "CVSSV4" }, { "category": "other", "text": "6.9", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.9", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is cvss data available from source Redhat", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5779785", "CSAFPID-5779786", "CSAFPID-5779787", "CSAFPID-5810304", "CSAFPID-5810305", "CSAFPID-5810306", "CSAFPID-5810307", "CSAFPID-5810308", "CSAFPID-1439279", "CSAFPID-1441053", "CSAFPID-1441054", "CSAFPID-1441055", "CSAFPID-1441076", "CSAFPID-1488100", "CSAFPID-1488101", "CSAFPID-1488102", "CSAFPID-1488104", "CSAFPID-1496223", "CSAFPID-1906087", "CSAFPID-1906088", "CSAFPID-1906089", "CSAFPID-2109922", "CSAFPID-2551999", "CSAFPID-2552000", "CSAFPID-2914823", "CSAFPID-2914831", "CSAFPID-2914832", "CSAFPID-2914848", "CSAFPID-2942231", "CSAFPID-2942233", "CSAFPID-2942235", "CSAFPID-2942236", "CSAFPID-2942237", "CSAFPID-2960949", "CSAFPID-2960950", "CSAFPID-2985384", "CSAFPID-2985386", "CSAFPID-2985387", "CSAFPID-3036145", "CSAFPID-5119808", "CSAFPID-5119810", "CSAFPID-5119811", "CSAFPID-5446213", "CSAFPID-5446214", "CSAFPID-5446215", "CSAFPID-5446216", "CSAFPID-5446217", "CSAFPID-5446218", "CSAFPID-5446219", "CSAFPID-5446220", "CSAFPID-5845003", "CSAFPID-5845004", "CSAFPID-1317175" ], "known_not_affected": [ "CSAFPID-1508257", "CSAFPID-1919980", "CSAFPID-2652728", "CSAFPID-2652729" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31838" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31838" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-31838" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31838.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-31838" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0704.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-31838" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31838.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://github.com/istio/istio/security/advisories/GHSA-974c-2wxh-g4ww" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0704.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0704" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://docs.cloud.google.com/support/bulletins#gcp-2026-013" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://docs.cloud.google.com/service-mesh/docs/security-bulletins#gcp-2026-013" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-31838" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31838" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:5952" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:5950" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:5948" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1317175", "CSAFPID-1439279", "CSAFPID-1441053", "CSAFPID-1441054", "CSAFPID-1441055", "CSAFPID-1441076", "CSAFPID-1488100", "CSAFPID-1488101", "CSAFPID-1488102", "CSAFPID-1488104", "CSAFPID-1496223", "CSAFPID-1906087", "CSAFPID-1906088", "CSAFPID-1906089", "CSAFPID-2109922", "CSAFPID-2551999", "CSAFPID-2552000", "CSAFPID-2914823", "CSAFPID-2914831", "CSAFPID-2914832", "CSAFPID-2914848", "CSAFPID-2942231", "CSAFPID-2942233", "CSAFPID-2942235", "CSAFPID-2942236", "CSAFPID-2942237", "CSAFPID-2960949", "CSAFPID-2960950", "CSAFPID-2985384", "CSAFPID-2985386", "CSAFPID-2985387", "CSAFPID-3036145", "CSAFPID-5119808", "CSAFPID-5119810", "CSAFPID-5119811", "CSAFPID-5446213", "CSAFPID-5446214", "CSAFPID-5446215", "CSAFPID-5446216", "CSAFPID-5446217", "CSAFPID-5446218", "CSAFPID-5446219", "CSAFPID-5446220", "CSAFPID-5779785", "CSAFPID-5779786", "CSAFPID-5779787", "CSAFPID-5810304", "CSAFPID-5810305", "CSAFPID-5810306", "CSAFPID-5810307", "CSAFPID-5810308", "CSAFPID-5845003", "CSAFPID-5845004" ] } ], "title": "CVE-2026-31838" } ] }