{"answers":{"affected":"It affects 4 products.","exploited":"There is no known exploitation of CVE-2026-58649 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-58649 is a medium-severity vulnerability in Microsoft .Net, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-58649 and fix it if it is affected.\n\nWhat it is: CVE-2026-58649 is a medium-severity vulnerability in Microsoft .Net, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-58649 in the wild and no public exploit code.\n\nAffected product: Microsoft .Net. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-58649/ (Markdown: https://insights.sbomify.com/CVE-2026-58649/index.md)","id":"CVE-2026-58649","markdown":"https://insights.sbomify.com/CVE-2026-58649/index.md","name":"CVE-2026-58649","record":{"aliases":["ALSA-2026:67524","ALSA-2026:67525","ALSA-2026:68316","BELL-CVE-2026-58649","GHSA-44g5-m8vm-448v","RHSA-2026:67524","RHSA-2026:67525","RHSA-2026:68316","RHSA-2026:76978","RHSA-2026:77004","RLSA-2026:67524","RLSA-2026:67525","RLSA-2026:68316","UBUNTU-CVE-2026-58649"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":".NET runtime","requires_auth":"none","summary":"An origin validation error in .NET allows unauthorized attackers to disclose information over a network.","user_interaction":"required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"microsoft","cpe":[{"product":".net","vendor":"microsoft"},{"product":".net_sdk","vendor":"microsoft"},{"product":"visual_studio_2022","vendor":"microsoft"},{"product":"visual_studio_2026","vendor":"microsoft"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"description":"Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.","ecosystems":["AlmaLinux:10","AlmaLinux:8","AlmaLinux:9","Red Hat:enterprise_linux:10.2","Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:8::crb","Red Hat:enterprise_linux:9::appstream","Red Hat:enterprise_linux:9::crb","Red Hat:hummingbird:1","Rocky Linux:10","Rocky Linux:8","Rocky Linux:9"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":".NET Information Disclosure Vulnerability","id":"CVE-2026-58649","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"microsoft:.net","products":["microsoft:.net","microsoft:visual_studio_2022"],"type":"information_disclosure","year":"2026"},"n_packages":119,"n_references":1,"next":{"headline":"Visual Studio Code Security Feature Bypass Vulnerability","id":"CVE-2026-58650"},"packages":[{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-runtime-8.0","purl":"pkg:rpm/almalinux/aspnetcore-runtime-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-runtime-dbg-8.0","purl":"pkg:rpm/almalinux/aspnetcore-runtime-dbg-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-targeting-pack-8.0","purl":"pkg:rpm/almalinux/aspnetcore-targeting-pack-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-apphost-pack-8.0","purl":"pkg:rpm/almalinux/dotnet-apphost-pack-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-hostfxr-8.0","purl":"pkg:rpm/almalinux/dotnet-hostfxr-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-runtime-8.0","purl":"pkg:rpm/almalinux/dotnet-runtime-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-runtime-dbg-8.0","purl":"pkg:rpm/almalinux/dotnet-runtime-dbg-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.131-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-8.0","purl":"pkg:rpm/almalinux/dotnet-sdk-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.131-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-8.0-source-built-artifacts","purl":"pkg:rpm/almalinux/dotnet-sdk-8.0-source-built-artifacts","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.131-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-dbg-8.0","purl":"pkg:rpm/almalinux/dotnet-sdk-dbg-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-targeting-pack-8.0","purl":"pkg:rpm/almalinux/dotnet-targeting-pack-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:10","fixed":["8.0.131-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-templates-8.0","purl":"pkg:rpm/almalinux/dotnet-templates-8.0","source":"ALSA-2026:67525"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-runtime-8.0","purl":"pkg:rpm/almalinux/aspnetcore-runtime-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-runtime-dbg-8.0","purl":"pkg:rpm/almalinux/aspnetcore-runtime-dbg-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-targeting-pack-8.0","purl":"pkg:rpm/almalinux/aspnetcore-targeting-pack-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-apphost-pack-8.0","purl":"pkg:rpm/almalinux/dotnet-apphost-pack-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-hostfxr-8.0","purl":"pkg:rpm/almalinux/dotnet-hostfxr-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-runtime-8.0","purl":"pkg:rpm/almalinux/dotnet-runtime-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-runtime-dbg-8.0","purl":"pkg:rpm/almalinux/dotnet-runtime-dbg-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.131-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-8.0","purl":"pkg:rpm/almalinux/dotnet-sdk-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.131-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-8.0-source-built-artifacts","purl":"pkg:rpm/almalinux/dotnet-sdk-8.0-source-built-artifacts","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.131-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-sdk-dbg-8.0","purl":"pkg:rpm/almalinux/dotnet-sdk-dbg-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.31-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-targeting-pack-8.0","purl":"pkg:rpm/almalinux/dotnet-targeting-pack-8.0","source":"ALSA-2026:68316"},{"ecosystem":"AlmaLinux:8","fixed":["8.0.131-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"dotnet-templates-8.0","purl":"pkg:rpm/almalinux/dotn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Hat:enterprise_linux:10.2","fixed":["0:8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-runtime-8.0","purl":"pkg:rpm/redhat/aspnetcore-runtime-8.0","source":"RHSA-2026:67525"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-runtime-dbg-8.0","purl":"pkg:rpm/redhat/aspnetcore-runtime-dbg-8.0","source":"RHSA-2026:67525"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"aspnetcore-targeting-pack-8.0","purl":"pkg:rpm/redhat/aspnetcore-targeting-pack-8.0","source":"RHSA-2026:67525"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:8.0.31-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"dotnet-apphost-pack-8.0","purl":"pkg:rpm/redhat/dotnet-apphost-pack-8.0","source":"RHSA-2026:67525"}],"prev":{"headline":"Microsoft PowerBI Report Server Spoofing Vulnerability","id":"CVE-2026-58647"},"products":[".NET 10.0",".NET 11.0",".NET 8.0",".NET 9.0","Microsoft Visual Studio 2022 version 17.14","Microsoft Visual Studio 2026 version 18.9"],"published":"2026-09-08","related":[{"cvss_score":9.8,"headline":".NET and Visual Studio Remote Code Execution Vulnerability","id":"CVE-2024-43498","kev_date_added":null,"published":"2024-11-12"},{"cvss_score":9.1,"headline":"NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability","id":"CVE-2024-0057","kev_date_added":null,"published":"2024-01-09"},{"cvss_score":8.8,"headline":".NET Security Feature Bypass Vulnerability","id":"CVE-2026-96957","kev_date_added":null,"published":"2026-10-13"},{"cvss_score":8.8,"headline":".NET and Visual Studio Elevation of Privilege Vulnerability","id":"CVE-2026-69439","kev_date_added":null,"published":"2026-09-08"},{"cvss_score":8.8,"headline":".NET and Visual Studio Remote Code Execution Vulnerability","id":"CVE-2026-71328","kev_date_added":null,"published":"2026-09-08"},{"cvss_score":8.8,"headline":"ASP.NET Core Elevation of Privilege Vulnerability","id":"CVE-2026-47300","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":8.8,"headline":"ASP.NET Core Elevation of Privilege Vulnerability","id":"CVE-2026-47303","kev_date_added":null,"published":"2026-07-14"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-14","vendors":["Microsoft"]},"summary":"An origin validation error in .NET allows unauthorized attackers to disclose information over a network.","url":"https://insights.sbomify.com/CVE-2026-58649/"}