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…

PriorityP424medium4.9CVSS 3.1

AVNACLPRHUINSUCNINAH

EPSS

0.32%

23.4th percentile

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
nasa	cryptolib	< 1.4.3	1.4.3

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