Vulnerability Details CVE-2026-21900
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 19.1%
CVSS Severity
CVSS v3 Score 5.9
References
Products affected by CVE-2026-21900
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cpe:2.3:a:nasa:cryptolib:1.0.0
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cpe:2.3:a:nasa:cryptolib:1.0.1
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cpe:2.3:a:nasa:cryptolib:1.0.2
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cpe:2.3:a:nasa:cryptolib:1.0.3
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cpe:2.3:a:nasa:cryptolib:1.1.0
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cpe:2.3:a:nasa:cryptolib:1.1.1
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cpe:2.3:a:nasa:cryptolib:1.2.0
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cpe:2.3:a:nasa:cryptolib:1.2.1
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cpe:2.3:a:nasa:cryptolib:1.2.2
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cpe:2.3:a:nasa:cryptolib:1.2.3
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cpe:2.3:a:nasa:cryptolib:1.3.0
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cpe:2.3:a:nasa:cryptolib:1.3.1
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cpe:2.3:a:nasa:cryptolib:1.3.2
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cpe:2.3:a:nasa:cryptolib:1.3.3
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cpe:2.3:a:nasa:cryptolib:1.4.0
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cpe:2.3:a:nasa:cryptolib:1.4.1
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cpe:2.3:a:nasa:cryptolib:1.4.2