Description
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.
INFO
Published Date :
2026-04-09T15:50:26.548Z
Last Modified :
2026-04-09T16:15:19.583Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-39853 vulnerability.
| Vendors | Products |
|---|---|
| Mtrojnar |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-39853.
