Out-of-bounds Read in Nasa Cryptolib
CVE-2026-21898
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (37.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Nasa Cryptolib — versions < 1.4.3
Weakness classification (CWE)
References
- github.com/nasa/CryptoLib/security/advisories/GHSA-7ch6-2pmg-m853 (Exploit, Vendor Advisory)
- github.com/nasa/CryptoLib/releases/tag/v1.4.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-21898?
- CVE-2026-21898 is a high-severity vulnerability in Nasa Cryptolib, classified under Out-of-bounds Read. CVSS score: 8.2/10. Published 2026-01-10.
- How severe is CVE-2026-21898?
- High severity. CVSS v3 base score is 8.2 out of 10.