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CVE-2026-55586: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer in sumatrapdfreader sumatrapdfCVE-2026-55586 0 CVE-2026-55586 is a medium severity heap memory corruption vulnerability in SumatraPDF 3.6.1 and earlier. It arises from improper bounds checking in the LZX Huffman decoding process when parsing crafted CHM files. This flaw can cause writes beyond allocated buffer limits in the PRETREE_table, potentially corrupting adjacent heap memory. While arbitrary code execution has not been demonstrated, the vulnerability impacts the integrity and availability of the parser process. No official fix or patch is currently available. Join the discussion | CVE Database V5 | 08/20/2026, 16:35:07 UTC Added: 08/20/2026, 16:52:41 UTC |
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