CVE-2026-21899
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.
- Score
- CVSS 3.1 4.9 Medium
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-01-10
- Last modified
- 2026-01-12
- Weaknesses
- CWE-125
Affected products
References
- https://github.com/nasa/CryptoLib/releases/tag/v1.4.3
- https://github.com/nasa/CryptoLib/security/advisories/GHSA-wc29-5hw7-mpj8
