CVE-2026-21895
5.3 · MEDIUMOverview
CVE-2026-21895 is a medium-severity vulnerability affecting rustcrypto rsa. It was published on January 8, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
The `rsa` crate is an RSA implementation written in rust. Prior to version 0.9.10, when creating a RSA private key from its components, the construction panics instead of returning an error when one of the primes is `1`. Version 0.9.10 fixes the issue.
Remediation
Check the references section for vendor advisories and patches from rustcrypto. Update rsa to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| rustcrypto | rsa | >= 0, < 0.9.10 | Affected |
Frequently Asked Questions
What is CVE-2026-21895?
CVE-2026-21895 is a medium-severity vulnerability affecting rustcrypto rsa. It was published on January 8, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).
How severe is CVE-2026-21895?
This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-21895?
Check the references section for vendor advisories and patches from rustcrypto. Update rsa to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-21895?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-21895 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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