Unrated severityOSV Advisory· Published Jan 10, 2026· Updated Jan 13, 2026
CryptoLib Has Out-of-Bounds Read in KMC Encrypt Metadata Parsing via Flawed strtok Pattern
CVE-2026-21900
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.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/nasa/CryptoLib/commit/2372efd3da1ccb226b4297222e25f41ecc84821dmitrex_refsource_MISC
- github.com/nasa/CryptoLib/releases/tag/v1.4.3mitrex_refsource_MISC
- github.com/nasa/CryptoLib/security/advisories/GHSA-4g6v-36fv-qcvwmitrex_refsource_CONFIRM
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