CVE-2026-21899
4.7 · MEDIUMOverview
CVE-2026-21899 is a medium-severity vulnerability affecting nasa cryptolib. It was published on January 10, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communications between a spacecraft running the core Flight System (cFS) and a ground station. Prior to version 1.4.3, in base64urlDecode, padding-stripping dereferences input[inputLen - 1] before checking that inputLen > 0 or that input != NULL. For inputLen == 0, this becomes an OOB read at input[-1], potentially crashing the process. If input == NULL and inputLen == 0, it dereferences NULL - 1. This issue has been patched in version 1.4.3.
Remediation
Check the references section for vendor advisories and patches from nasa. Update cryptolib 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 |
|---|---|---|---|
| nasa | cryptolib | >= 0, < 1.4.3 | Affected |
Frequently Asked Questions
What is CVE-2026-21899?
CVE-2026-21899 is a medium-severity vulnerability affecting nasa cryptolib. It was published on January 10, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
How severe is CVE-2026-21899?
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-21899?
Check the references section for vendor advisories and patches from nasa. Update cryptolib 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-2026-21899?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-21899 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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