CVE-2026-66922 Pivotick Prototype-Key Collision in Tree Layout and Cycle Detection Allows Graph Manipulation and Denial of Service
Attackers can cause denial of service and corrupt graph data in Pivotick by supplying crafted node identifiers that exploit prototype pollution and argument limits.
- 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-2026-66922?
CVE-2026-66922 is a medium-severity 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 used plain JavaScript objects as lookup tables indexed by caller-controlled graph node identifiers in its tree-layout and cycle-detection components.
Node identifiers matching properties inherited from Object.prototype, such as constructor, toString, or __proto__, were not handled as ordinary identifiers. These values could be interpreted as existing inherited properties, resolve to values of an unexpected type, or—in the case of __proto__ assignments—modify the prototype of an internal lookup object.
An attacker who can supply graph data containing crafted node identifiers could consequently cause nodes or edges to be silently omitted, produce incorrect hierarchy levels, bypass or corrupt cycle-detection results, or trigger an exception that interrupts graph processing and rendering. This affects the integrity of graph visualisations and analytics and may cause a client-side denial-of-service condition.
The affected code also failed to safely handle edges whose source node was absent from the supplied node set. Furthermore, calculating the maximum tree depth by spreading all level values into Math.max() could exceed the JavaScript function-argument limit when processing a sufficiently large graph, resulting in an exception and denial of service.
The patch replaces identifier-keyed plain objects with Map instances, ignores invalid edges during tree construction, and calculates the maximum depth iteratively.
Weakness: CWE-1321
Which versions are affected by CVE-2026-66922?
How do I fix CVE-2026-66922?
No fix has been published for CVE-2026-66922 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66922 being exploited?
There is no known exploitation of CVE-2026-66922 in the wild and no public exploit code.
Sources
Also known as GHSA-fh4h-f94g-c2qp.