CVE-2026-77755 Denial of Service in MISP-STIX Import via Malformed or Oversized STIX Documents in misp-stix library

A denial-of-service vulnerability was identified in misp-stix when processing attacker-controlled STIX 1 or STIX 2 documents. The STIX import code used sys.exit to handle several parsing and loading failures. Because SystemExit inherits from BaseException rather than Exception, these failures...

CVE-2026-77755

misp-stix is a Python library used by MISP for importing STIX 1 and STIX 2 documents. Two distinct flaws allow denial-of-service: (1) the import code used sys.exit() for parsing failures, which raises SystemExit (a BaseException subclass) that bypasses standard exception handlers, causing uncontr...