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TI-2026-17599 Aliases CVE-2026-21899

CryptoLib has an out-of-bounds read and crash vulnerability when decoding an empty Base64url string

Priority LOW 22CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

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, in base64urlDecode, padding-stripping dereferences input[inputLen - 1] before checking that inputLen > 0 or that input != NULL. For inputLen == 0, this becomes an OOB read at input[-1], potentially crashing the process. If input == NULL and inputLen == 0, it dereferences NULL - 1. This issue has been patched in version 1.4.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00345 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed CryptoLib (nasa): 1.4.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nasaCryptoLibbefore 1.4.31.4.3Patch availableCNA
  • CryptoLib Vendornasa Affected before 1.4.3 Fixed in 1.4.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nasa:cryptolib:*:*:*:*:*:*:*:*before 1.4.3Vulnerablenasa
  • cpe:2.3:a:nasa:cryptolib:*:*:*:*:*:*:*:* Versions before 1.4.3 Vulnerable ·nasa

Remediation

  • Fix · CNA CryptoLib (nasa) Fixed in 1.4.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21899

References

Exploit 1

Other 1

  • TI-2025-21552 CryptoLib Has Heap Overflow in Crypto_TM_ProcessSecurity due to Unchecked Secondary Header Length CVSS 3.1CRITICAL 9.4
  • TI-2025-21662 Heap Buffer Overflow via Incomplete Length Check in `Crypto_TC_ApplySecurity` CVSS 4.0CRITICAL 9.3
  • TI-2025-21298 CryptoLib's Crypto_TC_Prep_AAD Has Buffer Overflow Due to Integer Underflow CVSS 4.0HIGH 8.9
  • TI-2025-21297 CryptoLib Has Heap Buffer Overflow Due to Unsigned Integer Underflow in Crypto_TC_ProcessSecurity CVSS 4.0HIGH 8.9
  • TI-2025-21296 CryptoLib Has Heap Buffer Overflow in Crypto_AOS_ProcessSecurity Function CVSS 4.0HIGH 8.9
  • TI-2025-21294 CryptoLib's Crypto_TC_ApplySecurity() Has a Heap Buffer Overflow Vulnerability CVSS 4.0HIGH 8.9
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences