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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.

PUBLISHED Reserved 2026-01-05 | Published 2026-01-10 | Updated 2026-01-13 | Assigner GitHub_M




HIGH: 8.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-125: Out-of-bounds Read

Product status

< 1.4.3
affected

References

github.com/...ptoLib/security/advisories/GHSA-4g6v-36fv-qcvw exploit

github.com/...ptoLib/security/advisories/GHSA-4g6v-36fv-qcvw

github.com/...ommit/2372efd3da1ccb226b4297222e25f41ecc84821d

github.com/nasa/CryptoLib/releases/tag/v1.4.3

cve.org (CVE-2026-21900)

nvd.nist.gov (CVE-2026-21900)

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