CVE-2026-109399
Last modified
CVE-2026-109399 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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..
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.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| sbabic | swupdate | <= 2026.05.1 |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-109399?
How severe is CVE-2026-109399?
How do I fix CVE-2026-109399?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-109392Pimcore through 2026.3.1 contains a stored cross-site script…5.4
- CVE-2026-109393QloApps through 1.7.0 contains an insecure direct object ref…6.3
- CVE-2026-109394Thirty bees through 1.7.0 contains an authentication bypass …7.4
- CVE-2026-109396Thelia before 3.1.2 and 3.2.x before 3.2.1 contains a CSV fo…4.2
- CVE-2026-109397Thelia before 3.1.2 and 3.2.x before 3.2.1 contains an unres…7.2
- CVE-2026-109398Gumlet php-image-resize before 3.0.1 contains a denial of se…7.5
- CVE-2026-1094GitLab has remediated an issue in GitLab CE/EE affecting all…4.6
- CVE-2026-10940Race in Codecs in Google Chrome on Windows prior to 149.0.78…8.3
- CVE-2026-109402A vulnerability was found in conductor-oss conductor 3.22.0.…6.3
- CVE-2026-109403A vulnerability was determined in conductor-oss conductor up…7.3
- CVE-2026-109404A vulnerability was identified in conductor-oss conductor up…5.3
- CVE-2026-109405A security flaw has been discovered in conductor-oss conduct…7.3
Are you affected by CVE-2026-109399?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST