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.
References (3)
Core 3
Core References
Exploit, Vendor Advisory x_refsource_confirm
https://github.com/nasa/CryptoLib/security/advisories/GHSA-4g6v-36fv-qcvw
Patch x_refsource_misc
https://github.com/nasa/CryptoLib/commit/2372efd3da1ccb226b4297222e25f41ecc84821d
Release Notes x_refsource_misc
https://github.com/nasa/CryptoLib/releases/tag/v1.4.3
Scores
CVSS v3
5.9
EPSS
0.0010
EPSS Percentile
27.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (1)
nasa/cryptolib
< 1.4.3
Published
Jan 10, 2026
Tracked Since
Feb 18, 2026