CVE-2026-39853

osslsigncode contains a stack buffer overflow in its signature verification paths (PE, MSI, CAB, script) when verifying PKCS#7 signatures. During digest copy from SpcIndirectDataContent into a fixed-size stack buffer (mdbuf[EVP_MAX_MD_SIZE], 64 bytes), the code does not validate the source length...

CVE-2026-39853 osslsigncode has a Stack Buffer Overflow via Unbounded Digest Copy During Signature Verification

osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.12, A stack buffer overflow vulnerability exists in osslsigncode in several signature verification paths. During verification of a PKCS7 signature, the code copies the digest value from a parsed...