Vulnerability · Published Sep 18, 2026 · Assigned by Fluid Attacks
CVE-2026-79954NASA CryptoLib 1.5.0 - TC receive path accepts Security Associations from the wrong GVCID
High 8.7
In plain English
A high-severity missing authentication in CryptoLib from NASA. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.6%top 52.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
Weakness: CWE-306 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://fluidattacks.com/advisories/linkin third-party-advisory
- https://github.com/nasa/CryptoLib product