NASA CryptoLib up to 1.4.2 Link Security Protocol Crypto_AOS_ProcessSecurity out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability has been found in NASA CryptoLib up to 1.4.2 and classified as critical. This issue affects the function Crypto_AOS_ProcessSecurity of the component Link Security Protocol. This manipulation causes out-of-bounds. The identification of this vulnerability is CVE-2026-21898. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in NASA CryptoLib up to 1.4.2. Affected by this vulnerability is the function Crypto_AOS_ProcessSecurity of the component Link Security Protocol. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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, the Crypto_AOS_ProcessSecurity function reads memory without valid bounds checking when parsing AOS frame hashes. This issue has been patched in version 1.4.3.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-21898 since 01/05/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.4.3 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-1896). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.2
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CryptoLib 1.4.3

Timelineinfo

01/05/2026 CVE reserved
01/10/2026 +5 days Advisory disclosed
01/10/2026 +0 days VulDB entry created
01/11/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-7ch6-2pmg-m853
Status: Confirmed

CVE: CVE-2026-21898 (🔒)
GCVE (CVE): GCVE-0-2026-21898
GCVE (VulDB): GCVE-100-340399
EUVD: 🔒

Entryinfo

Created: 01/10/2026 10:31
Updated: 01/11/2026 02:54
Changes: 01/10/2026 10:31 (67), 01/11/2026 02:54 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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