Buffer overflow in Mtrojnar Osslsigncode
CVE-2026-39853
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, t…
Vulnerability class: Buffer Overflow
EPSS: 0.000 (2.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Mtrojnar Osslsigncode — versions < 2.12
Weakness classification (CWE)
References
- https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-hx87-8754-xvh4 (x_refsource_CONFIRM)
- https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68 (x_refsource_MISC)
- https://github.com/mtrojnar/osslsigncode/releases/tag/2.12 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-39853?
- CVE-2026-39853 is a high-severity vulnerability in Mtrojnar Osslsigncode, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-04-09.
- How severe is CVE-2026-39853?
- High severity. CVSS v3 base score is 7.8 out of 10.