CVE-2026-40897
Arbitrary JS execution via math.js expression parser; fixed in 15.2.0.
Is CVE-2026-40897 being exploited?
Not confirmed. CVE-2026-40897 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 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-40897?
CVE-2026-40897 is rated High with a CVSS score of 8.8. 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-2026-40897?
Yes. A fix has been recorded for CVE-2026-40897. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40897 affect?
CVE-2026-40897 affects math.js 13.1.1–14.x. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40897?
Upgrade to 15.2.0+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via user-supplied math expressions; attacker can run code in the app context.
Patch when possible
- affected>= 13.1.1 and < 15.2.0
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.