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  4. CVE 2026 109399 swupdate through 2026051 cms signature
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Back to active CVEs
Critical · CVSS 9.2CVE-2026-109399

SWUpdate through 2026.05.1 CMS Signature Verification Bypass via Embedded IntermediatesCVE-2026-109399

Answer in brief

CVE-2026-109399 records a Critical severity (CVSS 9.2) vulnerability in SWUpdate through 2026.05.1 CMS Signature Verification Bypass via Embedded Intermediates. The current sources do not mark it as known exploited. The current feed maps sbabic/swupdate (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 12, 2026Updated Oct 12, 2026Source checked Oct 12, 2026First seen by HOL Oct 12, 2026Material review Oct 12, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.2
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps sbabic/swupdate (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
sbabic/swupdategeneric>=0 <=2026.05.1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for sbabic/swupdate.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 12, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencegroups.google.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Netcore NR268 CGI Execution user_ok improper authenticationSame generic ecosystem
  • Grav before 2.1.7 Information Disclosure via Nested .git DirectoriesSame generic ecosystem
  • Admidio 4.0.12 through 4.3.17 and 5.0.0 before 5.0.15 Reflected XSS via system/redirect.phpSame generic ecosystem
  • Admidio 5.0.0 before 5.0.15 Unauthenticated Stored XSS via Registration NameSame generic ecosystem
  • Admidio 4.3.2 through 4.3.17 and 5.0.0 before 5.0.15 Cross-Organization Access Control Bypass via members_assignment.phpSame generic ecosystem
  • Network-AI 5.0.0 before 5.15.2 Cross-Site WebSocket Hijacking via DashboardServerSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-295
Source
CVE List V5
Source checked
Oct 12, 2026
References
5 linked sources
Open source record