CVE-2026-21899

MEDIUM

4.7

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, in base64urlDecode, padding-stripping dereferences input[inputLen - 1] before checking that inputLen > 0 or that input != NULL. For inputLen == 0, this becomes an OOB read at input[-1], potentially crashing the process. If input == NULL and inputLen == 0, it dereferences NULL - 1. This issue has been patched in version 1.4.3.

CVE Details

CVSS v3.1 Score4.7

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredHIGH

User InteractionNONE

Published1/10/2026

Last Modified1/15/2026

Sourcenvd

Honeypot Sightings0

Affected Products

nasa:cryptolib

Weaknesses (CWE)

CWE-125

References

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

https://github.com/nasa/CryptoLib/security/advisories/GHSA-wc29-5hw7-mpj8(security-advisories@github.com)

IOC Correlations

No correlations recorded

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