{"id":"GHSA-c8gq-rhqh-wgwm","revision":null,"records":[{"revision":"cb5ebe75d15943a29976d7c60e6298ca","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-26127","aliases":[],"title":".NET Denial of Service Vulnerability","description":"Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.","state":0,"publishedAt":"2026-03-10T17:05:10.752+00:00","modifiedAt":"2026-06-19T18:17:53.202+00:00","affected":[{"ecosystem":"Vendor product","name":".NET 10.0","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \".NET 10.0\",\n                    \"versions\": [\n                        {\n                            \"version\": \"10.0.0\",\n                            \"lessThan\": \"10.0.4\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":".NET 9.0","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \".NET 9.0\",\n                    \"versions\": [\n                        {\n                            \"version\": \"9.0.0\",\n                            \"lessThan\": \"9.0.14\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Microsoft.Bcl.Memory","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Microsoft.Bcl.Memory\",\n                    \"versions\": [\n                        {\n                            \"version\": \"10.0.0\",\n                            \"lessThan\": \"10.0.4\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Microsoft.Bcl.Memory","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Microsoft.Bcl.Memory\",\n                    \"versions\": [\n                        {\n                            \"version\": \"9.0.0\",\n                            \"lessThan\": \"9.0.14\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","score":7.5,"severity":"HIGH"}],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26127"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-26127","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-26127","identifiers":["CVE-2026-26127"]},"retained":false,"historicalAffected":[]},{"revision":"3f37010a335a492f84fdb1d1062abd3e","observedAt":"2026-11-15T08:34:22.073+00:00","statement":{"source":"euvd","id":"EUVD-2026-10691","aliases":["CVE-2026-26127","GHSA-73j8-2gch-69rq","GHSA-c8gq-rhqh-wgwm"],"title":"Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.","description":"Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","score":7.5,"severity":null}],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26127"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-10691","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Mar 10, 2026, 5:05:10 PM","dateUpdated":"Jun 19, 2026, 6:17:53 PM"},"relatedAdvisories":[{"id":"RHSA-2026:4445","title":"Red Hat Security Advisory: .NET 10.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]},{"id":"RHSA-2026:10085","title":"Red Hat Security Advisory: .NET 9.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]},{"id":"RHSA-2026:4450","title":"Red Hat Security Advisory: .NET 9.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]},{"id":"RHSA-2026:10083","title":"Red Hat Security Advisory: .NET 9.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]},{"id":"NCSC-2026-0085","title":"Kwetsbaarheden verholpen in Microsoft Developer tools","vulnerabilityIds":["CVE-2026-26131","CVE-2026-26127","CVE-2026-26130"]},{"id":"RHSA-2026:4443","title":"Red Hat Security Advisory: .NET 9.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]},{"id":"WID-SEC-W-2026-0657","title":"Microsoft ASP.NET und .NET: Mehrere Schwachstellen","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130","CVE-2026-26131"]},{"id":"RHSA-2026:4453","title":"Red Hat Security Advisory: .NET 10.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]},{"id":"RHSA-2026:4458","title":"Red Hat Security Advisory: .NET 10.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]},{"id":"RHSA-2026:4456","title":"Red Hat Security Advisory: .NET 9.0 security update","vulnerabilityIds":["CVE-2026-26127","CVE-2026-26130"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-10691","identifiers":["EUVD-2026-10691","CVE-2026-26127","GHSA-73j8-2gch-69rq","GHSA-c8gq-rhqh-wgwm"]},"retained":false,"historicalAffected":[]},{"revision":"c046cc2c43bf477fb52852d8568ca4b9","observedAt":"2026-10-25T06:17:22.45+00:00","statement":{"source":"nvd","id":"CVE-2026-26127","aliases":[],"title":"Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.","description":"Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.","state":0,"publishedAt":"2026-03-10T18:18:41.713+00:00","modifiedAt":"2026-06-17T10:25:46.253+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · secure@microsoft.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26127"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-26127","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-125"],"productCriteria":["cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*","cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*","cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*","cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*","cpe:2.3:a:microsoft:bcl.memory:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-03-10T18:18:41.713","lastModified":"2026-06-17T10:25:46.253"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-26127","identifiers":["CVE-2026-26127"]},"retained":false,"historicalAffected":[]},{"revision":"4bd696f8753246498d4023996270a65c","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-73j8-2gch-69rq","aliases":["BIT-dotnet-2026-26127","BIT-dotnet-sdk-2026-26127","CVE-2026-26127"],"title":".NET Denial of Service Vulnerability","description":"# Microsoft Security Advisory CVE-2026-26127 – .NET Denial of Service Vulnerability\n\n## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in .NET 9.0 and .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.\n\nA denial of service vulnerability exists in .NET and Microsoft.Bcl.Memory due to an out-of-bounds read when decoding malformed Base64Url input.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/384\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Score:** 7.5\n- **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C`\n- **Severity:** High\n- **Weakness:** CWE-129 (Improper Validation of Array Index); CWE-125 (Out-of-bounds Read)\n\n## Affected Platforms\n\n- **Platforms:** All\n- **Architectures:** All\n\n## Affected Products\n\n### <a name=\".NET 9\"></a>.NET 9\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm)               | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64)           | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm)     | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm64) | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-x64)     | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-x64)               | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-arm64)               | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-x64)                   | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm)                   | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm64)               | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x64)                   | >= 9.0.0, <= 9.0.13 | 9.0.14\n[Microsoft.NetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x86)                   | >= 9.0.0, <= 9.0.13 | 9.0.14\n\n### <a name=\".NET 10\"></a>.NET 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.NetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm)               | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-arm64)           | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm)     | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-arm64) | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-musl-x64)     | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.linux-x64)               | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-arm64)               | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.osx-x64)                   | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm)                   | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-arm64)               | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x64)                   | >= 10.0.0, <= 10.0.3 | 10.0.4\n[Microsoft.NetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.NetCore.App.Runtime.win-x86)                   | >= 10.0.0, <= 10.0.3 | 10.0.4\n\n### <a name=\"Microsoft.Bcl.Memory 9.0.14\"></a>Microsoft.Bcl.Memory 9.0.14\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.Bcl.Memory](https://www.nuget.org/packages/Microsoft.Bcl.Memory)                                                     | >= 9.0.0, <= 9.0.13 | 9.0.14\n\n### <a name=\"Microsoft.Bcl.Memory 10.0.4\"></a>Microsoft.Bcl.Memory 10.0.4\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.Bcl.Memory](https://www.nuget.org/packages/Microsoft.Bcl.Memory)                                                     | >= 10.0.0, <= 10.0.3 | 10.0.4\n\n### <a name=\"how-fix\"></a>How to fix the issue\n\nTo update the Microsoft.Bcl.Memory NuGet package, apply one of the following methods:\n\nNuGet Package Manager UI in Visual Studio:\n- Open the project in Visual Studio.\n- Right-click on the project in Solution Explorer and select \"Manage NuGet Packages...\" or navigate to \"Project > Manage NuGet Packages\".\n- In the NuGet Package Manager window, select the \"Updates\" tab. This tab lists packages with available updates from the configured package sources.\n- Select the package(s) to update. A specific version can be chosen from the dropdown, or the latest available version can be selected.\n- Click the \"Update\" button.\n\nUsing the NuGet Package Manager Console in Visual Studio:\n- Open the project in Visual Studio.\n- Navigate to \"Tools > NuGet Package Manager > Package Manager Console\".\n- To update a specific package to its latest version, run the following Update-Package command:\n\n```\nUpdate-Package -Id Microsoft.Bcl.Memory\n```\n\nUsing the .NET CLI (Command Line Interface):\n- Open a terminal or command prompt in the project's directory.\n- To update a specific package to its latest version, run the following command:\n\n```\ndotnet package update Microsoft.Bcl.Memory\n```\n\nOnce the NuGet package reference has been updated, the application must be recompiled and redeployed. Additionally, it is recommended to update the runtime and/or SDKs, but unless the application targets .NET 9 or higher, updating the runtime and/or SDK is not a required step to patch this vulnerability.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf a potential security issue has been found in a supported version of .NET, it should be reported to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nQuestions about this issue can be asked on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. Questions can be asked in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-26127](https://www.cve.org/CVERecord?id=CVE-2026-26127)\n\n### Revisions\n\nV1.0 (March 10, 2026): Advisory 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