Improper Certificate Validation Affecting system.security.cryptography.xml package, versions [8.0.0,8.0.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published14 Oct 2026
- disclosed13 Oct 2026
- creditVaisha Bernard
Introduced: 13 Oct 2026
NewCVE-2026-96222 (opens in a new tab)How to fix?
Upgrade System.Security.Cryptography.Xml to version 8.0.5 or higher.
Overview
Affected versions of this package are vulnerable to Improper Certificate Validation via the KeyInfoX509Data process. An attacker can impersonate trusted entities or forge certificates by supplying serialized certificate formats containing attacker-controlled chain metadata instead of a plain X.509 certificate.