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CVE-2026-77751 – Path Traversal Leading to Arbitrary File Disclosure – MISP misp-stix ≤ 2026.7.8

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Summary

CVE-2026-77751 is a path traversal vulnerability (CWE-22) in misp-stix, the STIX 2 import/export component of the MISP threat intelligence platform. It affects handling of object template names during STIX 2 import and MISP-to-STIX 2 export, and carries a HIGH severity score of 8.8. A remote, unauthenticated attacker can craft a malicious object name to escape the intended template directory and cause disclosure of local files accessible to the MISP process.

Technical details

  • Root cause: Object template names supplied in STIX/MISP content are joined directly into a filesystem path (template directory + object name + definition.json) without restricting the name to a safe, single path component.
  • Trigger conditions: An attacker-controlled object name (e.g., a custom STIX object’s x_misp_name field) containing path separators or ../ traversal sequences reaches the template-resolution logic during STIX 2 import.
  • Persistence risk: A malicious object name can be stored in a MISP event and later reprocessed during STIX 2 export, meaning content introduced under one security context can trigger file access later, potentially under a different or more privileged process.
  • Attack vector: Network — no authentication or user interaction required beyond submitting/importing crafted STIX content.
  • Impact: Disclosure of arbitrary local definition.json-style files accessible to the process, whose contents may be interpreted as a template and copied into the converted object, along with modification of the resulting object’s metadata/semantics.

Affected software

  • MISP misp-stix component: versions 0 through 2026.7.8 (all versions prior to the fix)

Severity

  • CVSS Score: 8.8 (High)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade misp-stix to a version that includes the fix applied in commits a8b6808d and a0f54070, which validate object template names against a safe pattern (letters, digits, hyphens, underscores only) and route invalid names to a generic unknown-template object instead of resolving them from the filesystem.
  • If immediate patching is not possible: Restrict which users/systems can submit STIX 2 content for import, and monitor MISP logs for objects converted to unknown-template or template resolution warnings, which may indicate attempted exploitation. Limit filesystem permissions available to the MISP/misp-stix process to reduce the impact of any successful traversal.

References

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