CVE-2026-21899

MEDIUM EPSS 23.4%
Published Jan 10, 20265mo ago · Modified Jun 17, 20261w ago
4.9 CVSS 3.1
Medium
Find Similar
Published Jan 10, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
4.9
Exploitability
1.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
23.4% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 1

VendorProductVersionRange
nasacryptolib* <1.4.3

References 2

  • github.com https://github.com/nasa/CryptoLib/releases/tag/v1.4.3
    Release Notes
  • github.com https://github.com/nasa/CryptoLib/security/advisories/GHSA-wc29-5hw7-mpj8
    ExploitVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.