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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Thu, 15 Jan 2026 22:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:nasa:cryptolib:*:*:*:*:*:*:*:*

Mon, 12 Jan 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 12 Jan 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Nasa
Nasa cryptolib
Vendors & Products Nasa
Nasa cryptolib

Sat, 10 Jan 2026 00:45:00 +0000

Type Values Removed Values Added
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.
Title CryptoLib has an out-of-bounds read and crash vulnerability when decoding an empty Base64url string
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-12T20:23:08.304Z

Reserved: 2026-01-05T17:24:36.931Z

Link: CVE-2026-21899

cve-icon Vulnrichment

Updated: 2026-01-12T20:22:58.538Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-10T01:16:18.113

Modified: 2026-01-15T21:45:24.500

Link: CVE-2026-21899

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-12T14:36:36Z

Weaknesses