CVE-2026-107738 SumatraPDF: Untrusted binary record offset used without lower-bound validation

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, ChmFile::GetCharZ narrows file-controlled unsigned string offsets from /WINDOWS and /IVB to signed integers without a lower-bound check. An offset that becomes negative can make the function read before the /STRINGS buffer,...

CVE-2026-107730

The multi-format reader SumatraPDF (version 3.7.0.22298 ) contains a signed integer overflow vulnerability in the LitParseHeader() function located in src/LitDoc.cpp . The issue occurs because the software uses signed 32-bit arithmetic to compute the section offset (hdrLen + nPieces * 16) without...