CVE-2026-21900
- Source
- https://cve.org/CVERecord?id=CVE-2026-21900
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21900.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-21900
- Aliases
-
- GHSA-4g6v-36fv-qcvw
- Published
- 2026-01-10T00:14:33.782Z
- Modified
- 2026-03-14T12:47:08.588075Z
- Severity
-
- 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- CryptoLib Has Out-of-Bounds Read in KMC Encrypt Metadata Parsing via Flawed strtok Pattern
- Details
-
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, an out-of-bounds heap read vulnerability in cryptography_encrypt() occurs when parsing JSON metadata from KMC server responses. The flawed strtok iteration pattern uses ptr + strlen(ptr) + 1 which reads one byte past allocated buffer boundaries when processing short or malformed metadata strings. This issue has been patched in version 1.4.3.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-125" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21900.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21900.json
- https://github.com/nasa/CryptoLib/commit/2372efd3da1ccb226b4297222e25f41ecc84821d
- https://github.com/nasa/CryptoLib/releases/tag/v1.4.3
- https://github.com/nasa/CryptoLib/security/advisories/GHSA-4g6v-36fv-qcvw
- https://nvd.nist.gov/vuln/detail/CVE-2026-21900
Affected packages
Git / github.com/nasa/cryptolib
Affected ranges
- Type
- GIT
- Repo
- https://github.com/nasa/cryptolib
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed