{ "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-2026-33308", "tracking": { "current_release_date": "2026-03-28T18:02:44.221690Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33308", "initial_release_date": "2026-03-24T20:43:15.649968Z", "revision_history": [ { "date": "2026-03-24T20:43:15.649968Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-24T20:43:18.802999Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-24T20:53:58.769129Z", "number": "3", "summary": "Products created (1).| Product Identifiers created (1)." }, { "date": "2026-03-24T20:54:02.033319Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:57:46.538954Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1).| Unknown change." }, { "date": "2026-03-24T20:57:49.563676Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-24T21:37:37.713535Z", "number": "7", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-24T21:37:39.075028Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-28T18:02:05.738567Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (10).| Product Identifiers created (6).| References created (3)." }, { "date": "2026-03-28T18:02:10.668787Z", "number": "10", "summary": "NCSC Score updated." } ], "status": "interim", "version": "10" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.6-1.1", "product": { "name": "vers:unknown/0.6-1.1", "product_id": "CSAFPID-5958857", "product_identification_helper": { "purl": "pkg:deb/ubuntu/mod-gnutls@0.6-1.1?arch=source&distro=xenial" } } }, { "category": "product_version_range", "name": "vers:unknown/0.7.3-0ubuntu1", "product": { "name": "vers:unknown/0.7.3-0ubuntu1", "product_id": "CSAFPID-5958858", "product_identification_helper": { "purl": "pkg:deb/ubuntu/mod-gnutls@0.7.3-0ubuntu1?arch=source&distro=xenial" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-5958859" } } ], "category": "product_name", "name": "mod-gnutls" } ], "category": "product_family", "name": "Ubuntu:16.04:LTS" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.8.2-3ubuntu1", "product": { "name": "vers:unknown/0.8.2-3ubuntu1", "product_id": "CSAFPID-5958860", "product_identification_helper": { "purl": "pkg:deb/ubuntu/mod-gnutls@0.8.2-3ubuntu1?arch=source&distro=bionic" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-5958861" } } ], "category": "product_name", "name": "mod-gnutls" } ], "category": "product_family", "name": "Ubuntu:18.04:LTS" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.8.2-3ubuntu1", "product": { "name": "vers:unknown/0.8.2-3ubuntu1", "product_id": "CSAFPID-5958862", "product_identification_helper": { "purl": "pkg:deb/ubuntu/mod-gnutls@0.8.2-3ubuntu1?arch=source&distro=focal" } } }, { "category": "product_version_range", "name": "vers:unknown/0.9.0-1.1ubuntu1", "product": { "name": "vers:unknown/0.9.0-1.1ubuntu1", "product_id": "CSAFPID-5958863", "product_identification_helper": { "purl": "pkg:deb/ubuntu/mod-gnutls@0.9.0-1.1ubuntu1?arch=source&distro=focal" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-5958864" } } ], "category": "product_name", "name": "mod-gnutls" } ], "category": "product_family", "name": "Ubuntu:20.04:LTS" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.9.0-1.1ubuntu1", "product": { "name": "vers:unknown/0.9.0-1.1ubuntu1", "product_id": "CSAFPID-5958865", "product_identification_helper": { "purl": "pkg:deb/ubuntu/mod-gnutls@0.9.0-1.1ubuntu1?arch=source&distro=jammy" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-5958866" } } ], "category": "product_name", "name": "mod-gnutls" } ], "category": "product_family", "name": "Ubuntu:22.04:LTS" } ], "category": "vendor", "name": "Ubuntu" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.13.0", "product": { "name": "vers:unknown/<0.13.0", "product_id": "CSAFPID-5902920" } } ], "category": "product_name", "name": "mod_gnutls" } ], "category": "vendor", "name": "airtower-luna" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.13.0", "product": { "name": "vers:unknown/<0.13.0", "product_id": "CSAFPID-5902805", "product_identification_helper": { "cpe": "cpe:2.3:a:mod_gnutls_project:mod_gnutls:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "mod_gnutls" } ], "category": "vendor", "name": "mod_gnutls_project" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33308", "cwe": { "id": "CWE-295", "name": "Improper Certificate Validation" }, "notes": [ { "category": "description", "text": "Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Prior to version 0.13.0, code for client certificate verification did not check the key purpose as set in the Extended Key Usage extension. An attacker with access to the private key for a valid certificate issued by a CA trusted for TLS client authentication but designated for a different purpose could have used that certificate to improperly access resources requiring TLS client authentication. Server configurations that do not use client certificates (`GnuTLSClientVerify ignore`, the default) are not affected. The problem has been fixed in version 0.13.0 by rewriting certificate verification to use `gnutls_certificate_verify_peers()`, and requiring key purpose id-kp-clientAuth (also known as `tls_www_client` in GnuTLS) by default if the Extended Key Usage extension is present. The new `GnuTLSClientKeyPurpose` option allows overriding the expected key purpose if needed (please see the manual for details). Behavior for certificates without an Extended Key Usage extension is unchanged. If dedicated (sub-)CAs are used for issuing TLS client certificates only (not for any other purposes) the issue has no practical impact.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33308" }, { "category": "description", "text": "Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Prior to version 0.13.0, code for client certificate verification did not check the key purpose as set in the Extended Key Usage extension. An attacker with access to the private key for a valid certificate issued by a CA trusted for TLS client authentication but designated for a different purpose could have used that certificate to improperly access resources requiring TLS client authentication. Server configurations that do not use client certificates (`GnuTLSClientVerify ignore`, the default) are not affected. The problem has been fixed in version 0.13.0 by rewriting certificate verification to use `gnutls_certificate_verify_peers()`, and requiring key purpose id-kp-clientAuth (also known as `tls_www_client` in GnuTLS) by default if the Extended Key Usage extension is present. The new `GnuTLSClientKeyPurpose` option allows overriding the expected key purpose if needed (please see the manual for details). Behavior for certificates without an Extended Key Usage extension is unchanged. If dedicated (sub-)CAs are used for issuing TLS client certificates only (not for any other purposes) the issue has no practical impact.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33308.json" }, { "category": "description", "text": "Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Prior to version 0.13.0, code for client certificate verification did not check the key purpose as set in the Extended Key Usage extension. An attacker with access to the private key for a valid certificate issued by a CA trusted for TLS client authentication but designated for a different purpose could have used that certificate to improperly access resources requiring TLS client authentication. Server configurations that do not use client certificates (`GnuTLSClientVerify ignore`, the default) are not affected. The problem has been fixed in version 0.13.0 by rewriting certificate verification to use `gnutls_certificate_verify_peers()`, and requiring key purpose id-kp-clientAuth (also known as `tls_www_client` in GnuTLS) by default if the Extended Key Usage extension is present. The new `GnuTLSClientKeyPurpose` option allows overriding the expected key purpose if needed (please see the manual for details). Behavior for certificates without an Extended Key Usage extension is unchanged. If dedicated (sub-)CAs are used for issuing TLS client certificates only (not for any other purposes) the issue has no practical impact.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Ubuntu%2FUBUNTU-CVE-2026-33308.json?alt=media" }, { "category": "other", "text": "0.00026", "title": "EPSS" }, { "category": "other", "text": "4.4", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent EPSS score, Is related to an uncommon product vendor, Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5902805", "CSAFPID-5902920", "CSAFPID-5958857", "CSAFPID-5958858", "CSAFPID-5958859", "CSAFPID-5958860", "CSAFPID-5958861", "CSAFPID-5958862", "CSAFPID-5958863", "CSAFPID-5958864", "CSAFPID-5958865", "CSAFPID-5958866" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33308" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33308.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Ubuntu%2FUBUNTU-CVE-2026-33308.json?alt=media" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; osv", "url": "https://github.com/airtower-luna/mod_gnutls/security/advisories/GHSA-hm2g-m958-8qgh" }, { "category": "external", "summary": "Reference - osv", "url": "https://ubuntu.com/security/CVE-2026-33308" }, { "category": "external", "summary": "Reference - osv", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33308" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N", "baseScore": 6.8, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5902805", "CSAFPID-5902920", "CSAFPID-5958857", "CSAFPID-5958858", "CSAFPID-5958859", "CSAFPID-5958860", "CSAFPID-5958861", "CSAFPID-5958862", "CSAFPID-5958863", "CSAFPID-5958864", "CSAFPID-5958865", "CSAFPID-5958866" ] } ], "title": "CVE-2026-33308" } ] }