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.
Published: 2026-10-12
Score: 9.2 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sun, 18 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 12 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title SWUpdate through 2026.05.1 CMS Signature Verification Bypass via Embedded Intermediates
First Time appeared Swupdate
Swupdate swupdate
Weaknesses CWE-295
CPEs cpe:2.3:a:swupdate:swupdate:*:*:*:*:*:*:*:*
Vendors & Products Swupdate
Swupdate swupdate
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Swupdate Swupdate
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-18T12:03:15.694Z

Reserved: 2026-10-12T14:40:48.738Z

Link: CVE-2026-109399

cve-icon Vulnrichment

Updated: 2026-10-18T11:53:31.776Z

cve-icon NVD

Status : Deferred

Published: 2026-10-12T16:17:05.557

Modified: 2026-10-18T12:17:05.220

Link: CVE-2026-109399

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-12T16:45:14Z

Weaknesses
  • CWE-295

    Improper Certificate Validation