Asymmetric Resource Consumption Affecting system.security.cryptography.pkcs package, versions [,8.0.2)[9.0.0-preview.1.24080.9,9.0.21)[10.0.0-preview.1.25080.5,10.0.13)[11.0.0-preview.1.26104.118,11.0.0-rc.2.26504.105)
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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Test your applications- Snyk IDSNYK-DOTNET-SYSTEMSECURITYCRYPTOGRAPHYPKCS-20935725
- published14 Oct 2026
- disclosed13 Oct 2026
- creditDr.-Ing Ashar Javed
Introduced: 13 Oct 2026
NewCVE-2026-70162 (opens in a new tab)How to fix?
Upgrade System.Security.Cryptography.Pkcs to version 8.0.2, 9.0.21, 10.0.13, 11.0.0-rc.2.26504.105 or higher.
Overview
Affected versions of this package are vulnerable to Asymmetric Resource Consumption in the EnvelopedCms.Decode method, which performs quadratic work while processing the attributes of a CMS or PKCS#7 message. An attacker can exhaust CPU on the host before any authentication step by submitting an enveloped message whose attribute set is sized to maximize that work. This affects Windows only, across all architectures, and requires an application that decodes CMS or PKCS#7 input it does not control.