How severe is CVE-2026-21898?

CVE-2026-21898 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2026-21898 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21898?

CVE-2026-21898 affects Nasa Cryptolib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21898?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-21898 have an EU (EUVD) identifier?

Yes. CVE-2026-21898 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1896.

When was CVE-2026-21898 published?

CVE-2026-21898 was published on 2026-01-10 and last updated on 2026-06-17.

CVE-2026-21898

CVE-2026-21898 is a high-severity vulnerability in Nasa Cryptolib with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1896
Weakness: CWE-125
Affected product: Nasa Cryptolib
Published: 2026-01-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-21898?: 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.
How severe is CVE-2026-21898?: CVE-2026-21898 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2026-21898 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21898?: CVE-2026-21898 affects Nasa Cryptolib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21898?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-21898 have an EU (EUVD) identifier?: Yes. CVE-2026-21898 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1896.
When was CVE-2026-21898 published?: CVE-2026-21898 was published on 2026-01-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nasa:cryptolib:*:*:*:*:*:*:*:*

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