CVE-2026-25961 | BDVDB-2026-314571 Detail

Description#

SumatraPDF is a multi-format reader for Windows. In 3.5.0 through 3.5.2, SumatraPDF's update mechanism disables TLS hostname verification (INTERNET_FLAG_IGNORE_CERT_CN_INVALID) and executes installers without signature checks. A network attacker with any valid TLS certificate (e.g., Let's Encrypt) can intercept the update check request, inject a malicious installer URL, and achieve arbitrary code execution.

Impact#

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Exploit#

History#

1. Version 12026-02-09Record published in the CVE List.
2. Version 22026-02-10Most recent update recorded in the CVE List.