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CVE-2026-21900

MEDIUM

5.9

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.

CVE Details

CVSS v3.1 Score5.9

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published1/10/2026

Last Modified1/16/2026

Sourcenvd

Honeypot Sightings0

Affected Products

nasa:cryptolib

Weaknesses (CWE)

CWE-125

References

https://github.com/nasa/CryptoLib/commit/2372efd3da1ccb226b4297222e25f41ecc84821d(security-advisories@github.com)

https://github.com/nasa/CryptoLib/releases/tag/v1.4.3(security-advisories@github.com)

https://github.com/nasa/CryptoLib/security/advisories/GHSA-4g6v-36fv-qcvw(security-advisories@github.com)

https://github.com/nasa/CryptoLib/security/advisories/GHSA-4g6v-36fv-qcvw(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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