CVE-2026-73053
RCE via crafted document icons in SiYuan renderer (pre-3.7.4).
Is CVE-2026-73053 being exploited?
Not confirmed. CVE-2026-73053 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 0.28% probability of exploitation in the next 30 days.
How severe is CVE-2026-73053?
CVE-2026-73053 is rated Critical with a CVSS score of 9.4. 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-2026-73053?
Yes. A fix has been recorded for CVE-2026-73053. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73053 affect?
CVE-2026-73053 affects SiYuan < 3.7.4 (desktop clients), Windows, macOS, Linux, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73053?
Upgrade to v3.7.4+, disable Node integration, block untrusted documents.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary code execution on host via crafted hex-encoded document icons in renderer when Node integration is enabled; full system compromise possible.
Immediate action required
- affected< 3.7.4
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.