Vulnerability · Published Jan 10, 2026 · Assigned by GitHub_M

CVE-2026-21898CryptoLib Has Out-of-bounds Read in Crypto_AOS_ProcessSecurity

High 8.2

In plain English

A high-severity out-of-bounds read in CryptoLib from nasa. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.4%top 60.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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

Affected products (as reported)

Vendor	Product	Versions
nasa	CryptoLib	< 1.4.3

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References

https://github.com/nasa/CryptoLib/security/advisories/GHSA-7ch6-2pmg-m853 x_refsource_CONFIRM
https://github.com/nasa/CryptoLib/releases/tag/v1.4.3 x_refsource_MISC