# 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.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`)
- **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 available:** No
- **Published:** 28 Jul 2026
- **Updated:** 28 Jul 2026
- **Also known as:** GHSA-cgxr-m8cj-3q4w

## 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.

Weakness: CWE-674 (Uncontrolled Recursion), CWE-400 (Uncontrolled Resource Consumption)

## 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.

## Is CVE-2026-66920 being exploited?

There is no known exploitation of CVE-2026-66920 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66920 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-66920 in the wild and no public exploit code.

Affected product: Pivotick. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-66920/ (Markdown: https://insights.sbomify.com/CVE-2026-66920/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66920
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66920
- OSV: https://osv.dev/vulnerability/CVE-2026-66920

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66920/
Summaries are generated and may contain mistakes; the official description above is the record.