CVE-2026-109399 — SWUpdate through 2026.05.1 CMS Signature Verification Bypass via Embedded Intermediates
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…
Published: 2026-10-12 · CVSS: 9.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7