Vulnerability details

CVE-2026-21897

nasa CryptoLib

CryptoLib Has Out-of-Bounds Write in Crypto_Config_Add_Gvcid_Managed_Parameters

CVSS 3.1

7.3High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.3High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`

Affected products

Vendor	Product	Versions	Source
nasa	CryptoLib	< 1.4.3	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/nasa/CryptoLib/security/advisories/GHSA-9x7j-gx23-7m5r x_refsource_CONFIRM
https://github.com/nasa/CryptoLib/releases/tag/v1.4.3 x_refsource_MISC

Kolun on Telegram @kolunsec Exploited CVEs, key news and a daily digest Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published: 2026-01-10
Last updated: 2026-01-12
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.28%

Probability of exploitation in 30 days

20.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-787
Out-of-bounds Write