CVE-2026-21900

Medium

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, an out-of-bounds heap read vulnerability in cryptography_encrypt() occurs when parsing JSON metadata from KMC server responses. The flawed strtok iteration pattern uses ptr + strlen(ptr) + 1 which reads one byte past allocated buffer boundaries when processing short or malformed metadata strings. This issue has been patched in version 1.4.3.

SeverityMedium

CVSS5.9

Exploit probability—

ProductNasa Cryptolib

PublishedJan 10, 2026

First seenJan 10, 2026

Weakness typeCWE-125Out-of-bounds read

How to fix

Update

nasa cryptolib1.4.3 or later

Affected products

Product	Affected versions	Fixed in
nasa cryptolib	v < 1.4.3	1.4.3

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