CVE-2026-40345
deepmerge-ts <8.0.0 can crash Node.js via recursive object merges (DoS).
Is CVE-2026-40345 being exploited?
Not confirmed. CVE-2026-40345 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 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-40345?
CVE-2026-40345 is rated High with a CVSS score of 8.2. 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-2026-40345?
Yes. A fix has been recorded for CVE-2026-40345. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40345 affect?
CVE-2026-40345 affects deepmerge-ts < 8.0.0, Node.js apps using deepmerge, deepmergeCustom, deepmergeInto, deepmergeIntoCustom APIs. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40345?
Upgrade to deepmerge-ts >= 8.0.0 and validate or limit recursive object input.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-supplied recursive object graphs can trigger RangeError stack overflow, crashing Node.js processes or causing repeated worker restarts (Denial of Service).
Patch when possible
- affected< 8.0.0
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.