Buffer overflow in Nasa Cryptolib
CVE-2026-22027
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, the convert_hexstring_to_byte_array() function in the MariaDB SA interface writes decoded bytes into a caller-provided buffer without any capacity check. When importing SA fields from the database (e.g., IV, ARSN, ABM), a malformed or oversized hex string in the database can overflow the destination buffer, corrupting adjacent heap memory. This issue has been patched in version 1.4.3.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (13.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Nasa Cryptolib — versions < 1.4.3
Weakness classification (CWE)
References
- github.com/nasa/CryptoLib/security/advisories/GHSA-3m35-m689-h29x (Exploit, Vendor Advisory)
- github.com/nasa/CryptoLib/commit/2372efd3da1ccb226b4297222e25f41ecc84821d (Patch)
- github.com/nasa/CryptoLib/releases/tag/v1.4.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-22027?
- CVE-2026-22027 is a medium-severity vulnerability in Nasa Cryptolib, classified under Heap-based Buffer Overflow. CVSS score: 6.0/10. Published 2026-01-10.
- How severe is CVE-2026-22027?
- Medium severity. CVSS v3 base score is 6.0 out of 10.