CVE-2026-39856 osslsigncode has an Out-of-Bounds Read via Unvalidated Section Bounds in PE Page Hash Calculation

osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.13, an out-of-bounds read vulnerability exists in osslsigncode version 2.12 and earlier in the PE page-hash computation code pepagehashcalc. When processing PE sections for page hashing, the function uses...

CVE-2026-39856

osslsigncode (before 2.13) has an out-of-bounds read in PE page-hash calculation (pe_page_hash_calc) when processing PE sections. The code uses PointerToRawData and SizeOfRawData from section headers without ensuring the referenced region lies within the mapped file, allowing an attacker to craft...