{"affected":[{"product":"sumatrapdf","source":"CNA: GitHub_M","vendor":"sumatrapdfreader","versions":[{"status":"affected","version":"<= 3.6.1"}]}],"cveId":"CVE-2026-115758","cwes":["CWE-297"],"description":"SumatraPDF is a multi-format reader for Windows. In version 3.6.1 and earlier, HttpGet() in src/base/Http_win.cpp unconditionally passes INTERNET_FLAG_IGNORE_CERT_CN_INVALID to WinINet, disabling hostname matching for HTTPS update metadata and crash-symbol requests while retaining certificate-chain validation. A network-positioned attacker with a Windows-trusted certificate for an attacker-controlled domain can impersonate the project's update host, inject promo text and a clickable URL before update metadata validation, and provide an attacker-controlled archive to ExtractSymbols(). Installer replacement is not directly possible because HttpGetToFile() validates TLS and MaybeStartUpdateDownload() restricts the download host. No fixed version is available as of this review.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.2,"severity":"high","source":"CNA: GitHub_M","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"}],"modifiedAt":1793825095316,"publishedAt":1793825095316,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-mjwr-9w29-jp96"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/sumatrapdfreader/sumatrapdf/commit/bd30134175e897dd5ed0d7fd14acce52eeca7183"}],"remediation":[],"revision":"5cab1dd760b2420edd9b7ffda554b3cb75918277b74bb26997038504be17392d","sources":[{"modifiedAt":1793825095316,"name":"CNA: GitHub_M","retrievedAt":1793826608752,"url":"https://www.cve.org/CVERecord?id=CVE-2026-115758"}],"ssvc":null,"status":"published","title":"SumatraPDF: TLS hostname validation disabled in `HttpGet()`","updatedAt":1793826608752}