CVE-2026-77413
Remote code execution via crafted JSONata expressions accessing prototype members.
Is CVE-2026-77413 being exploited?
Not confirmed. CVE-2026-77413 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 0.52% probability of exploitation in the next 30 days.
How severe is CVE-2026-77413?
CVE-2026-77413 is rated Critical with a CVSS score of 9.3. 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-2026-77413?
Yes. A fix has been recorded for CVE-2026-77413. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77413 affect?
CVE-2026-77413 affects JSONata <1.8.8, JSONata <2.2.0, Applications using JSONata in Node.js that evaluate untrusted expressions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77413?
Upgrade to JSONata >=1.8.8 or >=2.2.0 and stop evaluating untrusted expressions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-supplied JSONata expression can access prototype members to reach child_process and execute arbitrary code as the host process.
Immediate action required
- affected< 2.2.0
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.