CVE-2026-21897

High

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, the Crypto_Config_Add_Gvcid_Managed_Parameters function only checks whether gvcid_counter > GVCID_MAN_PARAM_SIZE. As a result, it allows up to the 251st entry, which causes a write past the end of the array, overwriting gvcid_counter located immediately after gvcid_managed_parameters_array[250]. This leads to an out-of-bounds write, and the overwritten gvcid_counter may become an arbitrary value, potentially affecting the parameter lookup/registration logic that relies on it. This issue has been patched in version 1.4.3.

SeverityHigh

CVSS7.3

Exploit probability—

ProductNasa Cryptolib

PublishedJan 10, 2026

First seenJan 10, 2026

Weakness typeCWE-787Out-of-bounds write

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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