{ "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-2026-26061", "tracking": { "current_release_date": "2026-03-31T19:31:50.089786Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-26061", "initial_release_date": "2026-03-27T19:48:29.740701Z", "revision_history": [ { "date": "2026-03-27T19:48:29.740701Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-27T19:48:31.818490Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-27T20:28:34.518976Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-27T20:28:40.025875Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-27T21:12:59.707455Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-27T21:13:01.314112Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:40:44.395585Z", "number": "7", "summary": "References created (1)." }, { "date": "2026-03-29T00:52:41.604424Z", "number": "8", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-29T00:52:51.838999Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-30T12:07:50.517012Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (12)." }, { "date": "2026-03-30T12:07:54.916875Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-31T14:39:36.426504Z", "number": "12", "summary": "Unknown change." }, { "date": "2026-03-31T14:39:37.902044Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-31T19:27:47.144179Z", "number": "14", "summary": "CVSS created.| Products connected (1).| Product Identifiers created (1)." }, { "date": "2026-03-31T19:27:48.727867Z", "number": "15", "summary": "NCSC Score updated." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<4.81.1", "product": { "name": "vers:unknown/<4.81.1", "product_id": "CSAFPID-5963606" } } ], "category": "product_name", "name": "Fleet" } ], "category": "vendor", "name": "Open Source" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<4.81.0", "product": { "name": "vers:unknown/<4.81.0", "product_id": "CSAFPID-5944572", "product_identification_helper": { "cpe": "cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "fleet" } ], "category": "vendor", "name": "fleetdm" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-26061", "cwe": { "id": "CWE-770", "name": "Allocation of Resources Without Limits or Throttling" }, "notes": [ { "category": "description", "text": "Fleet is open source device management software. Prior to 4.81.0, Fleet contained multiple unauthenticated HTTP endpoints that read request bodies without enforcing a size limit. An unauthenticated attacker could exploit this behavior by sending large or repeated HTTP payloads, causing excessive memory allocation and resulting in a denial-of-service (DoS) condition. Version 4.81.0 patches the issue.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/26xxx/CVE-2026-26061.json" }, { "category": "description", "text": "### Summary\n\nFleet contained multiple unauthenticated HTTP endpoints that read request bodies without enforcing a size limit. An unauthenticated attacker could exploit this behavior by sending large or repeated HTTP payloads, causing excessive memory allocation and resulting in a denial-of-service (DoS) condition.\n\n### Impact\n\nAn unauthenticated attacker could cause the Fleet server process to exhaust available memory and restart by sending oversized or repeated HTTP requests to affected endpoints.\n\nThis vulnerability impacts **availability only**. There is:\n\n- No exposure of sensitive data\n- No authentication bypass\n- No privilege escalation\n- No integrity impact\n\n### Workarounds\n\nIf upgrading immediately is not possible, the following mitigations can reduce exposure:\n\n- Apply request body size limits at a reverse proxy or load balancer (e.g., NGINX, Envoy).\n- Restrict network access to endpoints to known IP ranges where feasible.\n- Monitor memory usage and restart frequency for abnormal patterns.\n\n### For More Information\n\nIf there are any questions or concerns about this advisory, please contact us at:\n\nEmail Fleet at [security@fleetdm.com](mailto:security@fleetdm.com)\n\n### Credits\n\nFleet thanks @fuzzztf for responsibly reporting this issue.", "title": "github - https://api.github.com/advisories/GHSA-99hj-44vg-hfcp" }, { "category": "description", "text": "Fleet is open source device management software. Prior to 4.81.0, Fleet contained multiple unauthenticated HTTP endpoints that read request bodies without enforcing a size limit. An unauthenticated attacker could exploit this behavior by sending large or repeated HTTP payloads, causing excessive memory allocation and resulting in a denial-of-service (DoS) condition. Version 4.81.0 patches the issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-26061" }, { "category": "other", "text": "0.00051", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "title": "CVSSV4" }, { "category": "other", "text": "8.7", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.8", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Nvd, There is product data available from source Certbundde, Is related to CWE-770 (Allocation of Resources Without Limits or Throttling)", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is cwe data available from source Github, Is related to a product by vendor Open Source", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5944572", "CSAFPID-5963606" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/26xxx/CVE-2026-26061.json" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-99hj-44vg-hfcp" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-26061" }, { "category": "external", "summary": "Source - 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-2026-0902.json" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; github; nvd", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-99hj-44vg-hfcp" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-99hj-44vg-hfcp" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26061" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0902.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0902" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-3458-r943-hmx4" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-4f9r-x588-pp2h" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-7rhw-5mpv-gp4h" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-9p23-p2m4-2r4m" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-m2h6-4xpq-qw3m" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-v895-833r-8c45" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-wg7j-pcc3-h4rh" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-5944572", "CSAFPID-5963606" ] } ], "title": "CVE-2026-26061" } ] }