🛡️ CVE-2026-21900
🟡 CVSS 5.9 — Medium ⚠️ Exploit Public CWE-125 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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, an out-of-bounds heap read vulnerability in cryptography_encrypt() occurs when parsing JSON metadata from KMC server responses. The flawed strtok iteration pattern uses ptr + strlen(ptr) + 1 which reads one byte past allocated buffer boundaries when processing short or malformed metadata strings. This issue has been patched in version 1.4.3.

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-125
Public Exploit ⚠️ Yes
Source NVD
Published 2026-01-10
Updated 2026-06-02
Modified 2026-01-16

Affected Packages

Software From version Fixed in
cryptolib — 1.4.3

Similar Threats

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