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CVE-2026-21898

Nasa Cryptolib out-of-bounds read

8.2 HIGHPublic exploitEPSS 0.45%
  1. Published10 Jan 2026

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected products

Nasa Cryptolib< 1.4.3

Remediation

Fixed in
Nasa Cryptolib≥ 1.4.3

References

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Frequently asked

Is CVE-2026-21898 being actively exploited?

CVE-2026-21898 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.45%.

How severe is CVE-2026-21898?

CVE-2026-21898 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 0.45% probability of exploitation.

Which products are affected by CVE-2026-21898?

Affected products include Nasa Cryptolib.

How do I fix CVE-2026-21898?

Upgrade affected software to a fixed version, for example Nasa Cryptolib 1.4.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.