CVE-2026-39853
Gravedad CVSS v3.1:
ALTA
Tipo:
CWE-121
Desbordamiendo de búfer basado en pila (Stack)
Fecha de publicación:
09/04/2026
Última modificación:
09/04/2026
Descripción
*** Pendiente de traducción *** 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 PKCS#7 signature, the code copies the digest value from a parsed SpcIndirectDataContent structure into a fixed-size stack buffer (mdbuf[EVP_MAX_MD_SIZE], 64 bytes) without validating that the source length fits within the destination buffer. This pattern is present in the verification handlers for PE, MSI, CAB, and script files. An attacker can craft a malicious signed file with an oversized digest field in SpcIndirectDataContent. When a user verifies such a file with osslsigncode verify, the unbounded memcpy can overflow the stack buffer and corrupt adjacent stack state. This vulnerability is fixed in 2.12.
Impacto
Puntuación base 3.x
7.80
Gravedad 3.x
ALTA