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CVE-2026-79954: NASA CryptoLib 1.5.0 - TC receive path accepts Security Associations from the wrong GVCID

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-18
• Weakness: CWE-306

Description

NASA CryptoLib 1.5.0 contains an authentication downgrade vulnerability in the Telecommand (TC) receive path. The receiver selects the Security Association used for SDLS processing solely from the SPI field inside the incoming frame, but it does not verify that the selected SA is authorized for the frame's GVCID.

Affected products

• nasa CryptoLib: 1.5.0

References

• https://fluidattacks.com/advisories/linkin
• https://github.com/nasa/CryptoLib

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