{ "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-2026-28377", "tracking": { "current_release_date": "2026-03-31T19:26:14.744868Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-28377", "initial_release_date": "2026-03-18T12:05:42.140232Z", "revision_history": [ { "date": "2026-03-18T12:05:42.140232Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Products created (1).| References created (3)." }, { "date": "2026-03-18T12:05:46.011657Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-23T11:44:16.957473Z", "number": "3", "summary": "Products connected (1).| Product Identifiers created (1).| References created (1)." }, { "date": "2026-03-23T11:44:26.560599Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-26T22:25:18.894608Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1)." }, { "date": "2026-03-26T22:25:25.128375Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-26T22:39:06.976399Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1)." }, { "date": "2026-03-26T22:39:17.187035Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:42:02.908726Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (6).| Product Identifiers created (3).| Product Remediations created (6).| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-27T19:42:10.590331Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:44:06.847311Z", "number": "11", "summary": "CWES updated (1).| Unknown change." }, { "date": "2026-03-27T19:44:32.965247Z", "number": "12", "summary": "CWES updated (1)." }, { "date": "2026-03-27T19:44:35.122139Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-27T21:05:16.218212Z", "number": "14", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-27T21:05:24.781807Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-31T19:26:02.562542Z", "number": "16", "summary": "Products created (1).| Product Identifiers created (1)." }, { "date": "2026-03-31T19:26:10.875175Z", "number": "17", "summary": "NCSC Score updated." } ], "status": "interim", "version": "17" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/10", "product": { "name": "vers:rpm/10", "product_id": "CSAFPID-2858634", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439317", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:8" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/9", "product": { "name": "vers:rpm/9", "product_id": "CSAFPID-1439319", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:9" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2868420" } } ], "category": "product_name", "name": "grafana" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1663145" } } ], "category": "product_name", "name": "grafana" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1496261" } } ], "category": "product_name", "name": "grafana" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317176", "product_identification_helper": { "cpe": "cpe:/o:suse:opensuse:-" } } } ], "category": "product_name", "name": "SUSE openSUSE" } ], "category": "vendor", "name": "SUSE" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:semver/2.10.3", "product": { "name": "vers:semver/2.10.3", "product_id": "CSAFPID-5919353" } }, { "category": "product_version_range", "name": "vers:unknown/<2.10.3", "product": { "name": "vers:unknown/<2.10.3", "product_id": "CSAFPID-5843730" } } ], "category": "product_name", "name": "Tempo" } ], "category": "vendor", "name": "Grafana" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<2.10.3", "product": { "name": "vers:unknown/<2.10.3", "product_id": "CSAFPID-5969515", "product_identification_helper": { "cpe": "cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "tempo" } ], "category": "vendor", "name": "grafana" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-28377", "cwe": { "id": "CWE-312", "name": "Cleartext Storage of Sensitive Information" }, "notes": [ { "category": "description", "text": "A vulnerability in Grafana Tempo exposes the S3 SSE-C encryption key in plaintext through the /status/config endpoint, potentially allowing unauthorized users to obtain the key used to encrypt trace data stored in S3.\n\nThanks to william_goodfellow for reporting this vulnerability.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-28377" }, { "category": "description", "text": "A vulnerability in Grafana Tempo exposes the S3 SSE-C encryption key in plaintext through the /status/config endpoint, potentially allowing unauthorized users to obtain the key used to encrypt trace data stored in S3.\n\nThanks to william_goodfellow for reporting this vulnerability.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/28xxx/CVE-2026-28377.json" }, { "category": "description", "text": "A flaw was found in Grafana Tempo. This vulnerability exposes the S3 Server-Side Encryption with Customer-Provided Keys (SSE-C) encryption key in plaintext through the /status/config endpoint. A remote attacker could exploit this to obtain the key, potentially allowing unauthorized access and decryption of sensitive trace data stored in S3.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-28377.json" }, { "category": "other", "text": "0.00018", "title": "EPSS" }, { "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": "Is related to (a version of) an uncommon product, The value of the most recent EPSS score", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5843730", "CSAFPID-1317176", "CSAFPID-5919353", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1496261", "CSAFPID-1663145", "CSAFPID-2858634", "CSAFPID-2868420", "CSAFPID-5969515" ] }, "references": [ { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0764.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-28377" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/28xxx/CVE-2026-28377.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-28377.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0764.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0764" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://grafana.com/security/security-advisories/cve-2026-28377/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/BAEGEZPTTTYUZPVJNVX3DSM4GUDNYJWE/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://grafana.com/security/security-advisories/cve-2026-28377" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-28377" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28377" } ], "remediations": [ { "category": "mitigation", "details": "Restrict network access to the Grafana Tempo service to trusted networks only. This will limit the ability of unauthorized remote attackers to access the `/status/config` endpoint and retrieve sensitive S3 encryption keys. Configure firewall rules to prevent external access to the Grafana Tempo service. This mitigation may impact legitimate access if not configured carefully. Ensure network restrictions persist across service reloads or system restarts.", "product_ids": [ "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1496261", "CSAFPID-1663145", "CSAFPID-2858634", "CSAFPID-2868420" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1317176", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1496261", "CSAFPID-1663145", "CSAFPID-2858634", "CSAFPID-2868420", "CSAFPID-5843730", "CSAFPID-5919353", "CSAFPID-5969515" ] } ], "title": "CVE-2026-28377" } ] }