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CVE-2026-21900— CryptoLib Has Out-of-Bounds Read in KMC Encrypt Metadata Parsing via Flawed strtok Pattern

Quick assessment

Affected
nasa CryptoLib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CryptoLib是NASA开源的一个应用程序。用于使用 CCSDS 空间数据链路安全协议提供纯软件解决方案。 CryptoLib 1.4.3之前版本存在缓冲区错误漏洞，该漏洞源于解析KMC服务器响应的JSON元数据时存在越界堆读取，可能导致读取超出分配的缓冲区边界。

AI Predicted 5.3 Difficulty: Easy EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-21900

Vulnerability Information
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Vulnerability Title
CryptoLib Has Out-of-Bounds Read in KMC Encrypt Metadata Parsing via Flawed strtok Pattern
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
CryptoLib 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CryptoLib是NASA开源的一个应用程序。用于使用 CCSDS 空间数据链路安全协议提供纯软件解决方案。 CryptoLib 1.4.3之前版本存在缓冲区错误漏洞，该漏洞源于解析KMC服务器响应的JSON元数据时存在越界堆读取，可能导致读取超出分配的缓冲区边界。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nasa CryptoLib < 1.4.3 -

II. Public POCs for CVE-2026-21900

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III. Intelligence Information for CVE-2026-21900

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Vendor Advisories for CVE-2026-21900 (1)

Same Patch Batch · nasa · 2026-01-10 · 10 CVEs total

CVE-2026-21898 8.2 HIGH CryptoLib Has Out-of-bounds Read in Crypto_AOS_ProcessSecurity
CVE-2026-22697 7.5 HIGH CryptoLib Has Heap Buffer Overflow Vulnerability in KMC Base64 Decode Handling (KMC JSON b
CVE-2026-21897 7.3 HIGH CryptoLib Has Out-of-Bounds Write in Crypto_Config_Add_Gvcid_Managed_Parameters
CVE-2026-21899 4.7 MEDIUM CryptoLib has an out-of-bounds read and crash vulnerability when decoding an empty Base64u
CVE-2026-22025 CryptoLib Memory Leak on HTTP Error Response in KMC Client
CVE-2026-22026 CryptoLib Unbounded Memory Allocation in KMC HTTP Response Handler Allows Resource Exhaust
CVE-2026-22023 CryptoLib Has Out-of-Bounds Read in KMC AEAD Encrypt Metadata Parsing via Flawed strtok Pa
CVE-2026-22024 CryptoLib Memory Leak in KMC Encrypt Function Leads to Resource Exhaustion
CVE-2026-22027 CryptoLib Vulnerable to Heap Buffer Overflow in MariaDB SA Hexstring Conversion

IV. Related Vulnerabilities

Same product: CryptoLib
Same vendor: nasa
Same weakness: CWE-125

V. Comments for CVE-2026-21900

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