CVE-2026-66920 Pivotick - Stack Exhaustion Denial of Service via Deep or Cyclic Graph Data
Attackers can cause browser crashes or freezes in Pivotick by supplying deeply nested or cyclic graph data, exhausting the JavaScript call stack.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-66920?
CVE-2026-66920 is a high-severity denial of service vulnerability in Pivotick, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Pivotick contains an uncontrolled-recursion vulnerability when processing caller-supplied graph and node data. The affected graph algorithms recursively traversed graph edges, while the JSON viewer recursively processed each level of a node’s data structure. A specially crafted graph containing an excessively long path, deeply nested properties, or circular object references could therefore exhaust the JavaScript call stack when Pivotick calculates a layout or displays a node in the inspection modal.
Successful exploitation may cause an uncaught exception, freeze the affected page, or crash the browser tab, resulting in a client-side denial of service. No confidentiality or integrity impact has been identified.
The patch replaces the recursive graph traversals with iterative stack-based implementations and limits the reachability calculation to 1,000,000 edge traversals. It also limits JSON rendering to 64 levels and detects circular references before descending further into an object.
Which versions are affected by CVE-2026-66920?
How do I fix CVE-2026-66920?
No fix has been published for CVE-2026-66920 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-66920 being exploited?
There is no known exploitation of CVE-2026-66920 in the wild and no public exploit code.
Sources
Also known as GHSA-cgxr-m8cj-3q4w.