State corruption via off-by-one bounds check
Published Jan 10, 2026 · Updated Jan 10, 2026
Out-of-bounds write in NASA CryptoLib before 1.4.3 allows remote attackers to corrupt managed-parameter state through repeated registration. Crypto_Config_Add_Gvcid_Managed_Parameters accepts a 251st entry because it rejects counters only above, rather than at, GVCID_MAN_PARAM_SIZE, then writes past gvcid_managed_parameters_array[250] into gvcid_counter. Reaching the registration path requires no privileges or user interaction; corrupting the counter can disrupt subsequent parameter lookup and registration.
Summary
What happened
Out-of-bounds write in NASA CryptoLib before 1.4.3 allows remote attackers to corrupt managed-parameter state through repeated registration. Crypto_Config_Add_Gvcid_Managed_Parameters accepts a 251st entry because it rejects counters only above, rather than at, GVCID_MAN_PARAM_SIZE, then writes past gvcid_managed_parameters_array[250] into gvcid_counter. Reaching the registration path requires no privileges or user interaction; corrupting the counter can disrupt subsequent parameter lookup and registration.
The record
- CVE
- CVE-2026-21897
- Published
- Jan 10, 2026
- Updated
- Jan 10, 2026
- Vendor
- NASA
- Product
- CryptoLib
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 10, 2026CVE publishedPublication date reported by the CVE source.
- Jan 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 1.4.3
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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