High severity8.1NVD Advisory· Published Oct 12, 2026
CVE-2026-109399
CVE-2026-109399
Description
SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_openssl.c that trusts untrusted X.509 certificates embedded in CMS SignedData for chain building. Attackers holding a signing key from a sibling intermediate under the same root can embed that intermediate in the signature to install malicious updates.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1Patches
Vulnerability mechanics
References
4- github.com/sbabic/swupdate/blob/2026.05.1/crypto/swupdate_cms_verify_openssl.cnvd
- github.com/sbabic/swupdate/commit/e66c5640664a31668926a24c0c84b6b6570dc0d9nvd
- groups.google.com/g/swupdate/c/dsoMcGFnEnsnvd
- www.vulncheck.com/advisories/swupdate-through-2026.05.1-cms-signature-verification-bypass-via-embedded-intermediatesnvd
News mentions
0No linked articles in our index yet.