{"answers":{"affected":"6 open source packages ship an affected version, including Microsoft.Native.Quic.MsQuic.OpenSSL.","exploited":"There is no known exploitation of CVE-2026-105794 in the wild and no public exploit code.","fix":"Upgrade Microsoft.Native.Quic.MsQuic.OpenSSL to a fixed version for your release line: 2.4.20, 2.5.11 or 2.6.1.","what":"CVE-2026-105794 is a critical vulnerability in microsoft msquic, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-105794 and fix it if it is affected.\n\nWhat it is: CVE-2026-105794 is a critical vulnerability in microsoft msquic, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-105794 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): affected all versions; fixed in 2.4.20\n- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): affected all versions; fixed in 2.4.20\n- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): affected from 2.5.0; fixed in 2.5.11\n- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): affected from 2.5.0; fixed in 2.5.11\n- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): affected from 2.6.0; fixed in 2.6.1\n- Microsoft.Native.Quic.MsQuic.OpenSSL (NuGet): affected from 2.6.0; fixed in 2.6.1\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-2026-105794/ (Markdown: https://insights.sbomify.com/CVE-2026-105794/index.md)","id":"CVE-2026-105794","markdown":"https://insights.sbomify.com/CVE-2026-105794/index.md","name":"CVE-2026-105794","record":{"aliases":["GHSA-w5f4-fx9m-m4q7"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"QUIC protocol library","requires_auth":"none","summary":"MsQuic clients using OpenSSL or QuicTLS fail to validate server hostnames, allowing on-path attackers to spoof servers via man-in-the-middle attacks.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"MsQuic is a cross-platform C implementation of the IETF QUIC protocol exposed to C, C++, C#, and Rust. Prior to 2.4.20, 2.5.11, and 2.6.1, MsQuic clients using the OpenSSL or QuicTLS TLS backend do not properly verify that a server certificate matches the intended target server hostname. An on-path attacker can therefore present a certificate that does not match the intended target hostname and spoof the server in a man-in-the-middle attack. The Schannel backend is not affected. This issue is fixed in versions 2.4.20, 2.5.11, and 2.6.1.","ecosystems":["NuGet"],"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":"MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL","id":"CVE-2026-105794","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":6,"n_references":12,"next":{"headline":"Kiota: Unsafe oauth_card_path references in Kiota-generated API plugin manifests","id":"CVE-2026-105795"},"packages":[{"ecosystem":"NuGet","fixed":["2.4.20"],"introduced":["0"],"last_affected":[],"package":"Microsoft.Native.Quic.MsQuic.OpenSSL","purl":null,"source":"GHSA-w5f4-fx9m-m4q7"},{"ecosystem":"NuGet","fixed":["2.4.20"],"introduced":["0"],"last_affected":[],"package":"Microsoft.Native.Quic.MsQuic.OpenSSL","purl":"pkg:nuget/Microsoft.Native.Quic.MsQuic.OpenSSL","source":"GHSA-w5f4-fx9m-m4q7"},{"ecosystem":"NuGet","fixed":["2.5.11"],"introduced":["2.5.0"],"last_affected":[],"package":"Microsoft.Native.Quic.MsQuic.OpenSSL","purl":null,"source":"GHSA-w5f4-fx9m-m4q7"},{"ecosystem":"NuGet","fixed":["2.5.11"],"introduced":["2.5.0"],"last_affected":[],"package":"Microsoft.Native.Quic.MsQuic.OpenSSL","purl":"pkg:nuget/Microsoft.Native.Quic.MsQuic.OpenSSL","source":"GHSA-w5f4-fx9m-m4q7"},{"ecosystem":"NuGet","fixed":["2.6.1"],"introduced":["2.6.0"],"last_affected":[],"package":"Microsoft.Native.Quic.MsQuic.OpenSSL","purl":null,"source":"GHSA-w5f4-fx9m-m4q7"},{"ecosystem":"NuGet","fixed":["2.6.1"],"introduced":["2.6.0"],"last_affected":[],"package":"Microsoft.Native.Quic.MsQuic.OpenSSL","purl":"pkg:nuget/Microsoft.Native.Quic.MsQuic.OpenSSL","source":"GHSA-w5f4-fx9m-m4q7"}],"prev":{"headline":"Microsoft UFO: Authenticated Android shell command injection in Mobile MCP `press_key`","id":"CVE-2026-105793"},"products":["msquic"],"published":"2026-10-06","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"2026-10-06","vendors":["microsoft"]},"summary":"MsQuic clients using OpenSSL or QuicTLS fail to validate server hostnames, allowing on-path attackers to spoof servers via man-in-the-middle attacks.","url":"https://insights.sbomify.com/CVE-2026-105794/"}