Out-of-bounds Read Affecting mtrojnar/osslsigncode package, versions [,2.13)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-MTROJNAROSSLSIGNCODE-16081989
- published16 Apr 2026
- disclosed9 Apr 2026
- creditopera-aklajn
Introduced: 9 Apr 2026
CVE-2026-39856 (opens in a new tab)How to fix?
Upgrade mtrojnar/osslsigncode to version 2.13 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read via the pe_page_hash_calc function. An attacker can cause the process to crash by providing a crafted PE file with section headers that reference data beyond the end of the file, leading to an attempt to read from an invalid memory region. This can occur when signing a malicious PE file with page hashing enabled or when verifying a malicious signed PE file that already contains page hashes.