CVE-2026-77755
DoS of MISP-STIX importer via crafted STIX 1/2 documents
Is CVE-2026-77755 being exploited?
Not confirmed. CVE-2026-77755 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-77755?
CVE-2026-77755 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-77755?
Yes. A fix has been recorded for CVE-2026-77755. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77755 affect?
CVE-2026-77755 affects misp-stix library, MISP STIX import workflows, Threat-intel ingestion pipelines using MISP. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77755?
Upgrade misp-stix to patched release and enforce STIX input-size limits and validation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote denial of service: crafted STIX can cause process termination or massive memory/CPU use, crashing importers and halting ingestion.
Patch when possible
- affected<= 2026.7.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.