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      <title>CVE-2026-107731 — SumatraPDF: LIT parser range-validation flaws cause invalid-pointer reads and denial of service</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-107731</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; sumatrapdfreader sumatrapdf&lt;/p&gt;
&lt;p&gt;SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, four independently reachable range-validation variants in src/LitDoc.cpp allow file-controlled offsets and sizes to overflow, narrow to negative values, or wrap before incomplete bounds checks. The affected calculations include contentOffset, the directory expression dirOff64 + dirLen64, and the decoded-section offset + size, along with secondary-header range handling. Opening a crafted LIT file that reaches one of these variants can cause invalid pointer reads and deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; sumatrapdfreader sumatrapdf&lt;/p&gt;
&lt;p&gt;SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, four independently reachable range-validation variants in src/LitDoc.cpp allow file-controlled offsets and sizes to overflow, narrow to negative values, or wrap before incomplete bounds checks. The affected calculations include contentOffset, the directory expression dirOff64 + dirLen64, and the decoded-section offset + size, along with secondary-header range handling. Opening a crafted LIT file that reaches one of these variants can cause invalid pointer reads and deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.&lt;/p&gt;</content:encoded>
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