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 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.
CVE-2026-109399
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-109399
swupdate
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/sbabic/swupdate",
"vendor": "sbabic",
"product": "swupdate",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "custom",
"lessThanOrEqual": "2026.05.1"
}
],
"packageURL": "pkg:github/sbabic/swupdate",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-109399
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #34675 · Revision 1
- Added to Heist Feed
- Publisher date