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Vulnerability record · CVE-2026-21897 · published 10 January 2026

CVE-2026-21897: Nasa cryptolib out-of-bounds write vulnerability

NNasa · Cryptolib

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_Config_Add_Gvcid_Managed_Parameters function only checks whether gvcid_counter > GVCID_MAN_PARAM_SIZE. As a result, it allows up to the 251st entry, which causes a write past the end of the array, overwriting gvcid_counter located immediately after gvcid_managed_parameters_array[250]. This leads to an out-of-bounds write, and the overwritten gvcid_counter may become an arbitrary value, potentially affecting the parameter lookup/registration logic that relies on it. This issue has been patched in version 1.4.3.

7.3 CVSS 3.1 High EPSS 0.29% · top 80.8% CWE-787 · Out-of-bounds write
7.3CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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, the Crypto_Config_Add_Gvcid_Managed_Parameters function only checks whether gvcid_counter > GVCID_MAN_PARAM_SIZE. As a result, it allows up to the 251st entry, which causes a write past the end of the array, overwriting gvcid_counter located immediately after gvcid_managed_parameters_array[250]. This leads to an out-of-bounds write, and the overwritten gvcid_counter may become an arbitrary value, potentially affecting the parameter lookup/registration logic that relies on it. This issue has been patched in version 1.4.3.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nasa/CryptoLib/releases/tag/v1.4.3 Release Notes
https://github.com/nasa/CryptoLib/security/advisories/GHSA-9x7j-gx23-7m5r Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2025-46673Nasa cryptolib improper control of dynamically-managed code vulnerabilityNASA CryptoLib before 1.3.2 does not check whether the SA is in an operational state before use, possibly leading to a bypass of the Space Data Link …EPSS 0.50%9.9CVE-2025-46674Nasa cryptolib vulnerabilityNASA CryptoLib before 1.3.2 uses Extended Procedures that are a Work in Progress (not intended for use during flight), potentially leading to a keyst…EPSS 0.60%9.3CVE-2025-30356Nasa cryptolib out-of-bounds write vulnerabilityCryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communication…EPSS 0.65%9.1CVE-2025-30216Nasa cryptolib heap-based buffer overflow vulnerabilityCryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communication…EPSS 2.7%8.9CVE-2025-29911Nasa cryptolib heap-based buffer overflow vulnerabilityCryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communication…EPSS 0.74%8.9CVE-2025-29912Nasa cryptolib heap-based buffer overflow vulnerabilityCryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communication…EPSS 1.1%8.9CVE-2025-29913Nasa cryptolib out-of-bounds read vulnerabilityCryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communication…EPSS 0.72%8.9CVE-2025-29909Nasa cryptolib out-of-bounds write vulnerabilityCryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communication…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2026-21897), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.