CVE-2026-21898

Name: CVE-2026-21898
Creator: NVD / NIST
Published: 2026-01-10T01:16:17.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.41%

Last modified Jun 17, 2026

CVE-2026-21898 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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_AOS_ProcessSecurity function reads memory without valid bounds checking when parsing AOS frame hashes. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

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_AOS_ProcessSecurity function reads memory without valid bounds checking when parsing AOS frame hashes. This issue has been patched in version 1.4.3.

Metrics

CVSS 3.1

8.2/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

EPSS Probability

0.41%

33.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Nasa	Cryptolib	< 1.4.3

References

https://github.com/nasa/CryptoLib/releases/tag/v1.4.3Release Notes
https://github.com/nasa/CryptoLib/security/advisories/GHSA-7ch6-2pmg-m853Exploit, Vendor Advisory
https://github.com/nasa/CryptoLib/security/advisories/GHSA-7ch6-2pmg-m853Exploit, Vendor Advisory

Timeline

Published: Jan 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21898?

How severe is CVE-2026-21898?

CVE-2026-21898 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21898?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21898?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST