CVE-2026-107733

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, FrameOnCommand() handles CmdExec by passing a null current-tab pointer to RunWithExe(), which dereferences WindowTab::filePath. A local process in the same interactive Windows session, at an integrity level greater than or equal to SumatraPDF's under Windows UIPI, can dispatch CmdExec over DDE or WM_COPYDATA while no document tab is open, causing abrupt process termination and loss of unsaved state. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.

• CWE-476

• https://github.com/sumatrapdfreader/sumatrapdf/commit/013ad659c7de13fa15624d1f8a24e3231c50516b
• https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-p2ph-2rvm-q37m

Published

Oct 8, 2026

Last Modified

Oct 8, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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