# CVE-2025-32792: ses library variable scope leakage in Compartment isolation

Source: https://junglewise.ai/threats/cve-2025-32792-ses-library-variable-scope-leakage-in-compartment-isolation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-04-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2025-32792 · Severity: medium · CVSS 4 · Published 2025-04-18

ses is a JavaScript library that provides secure sandboxing capabilities for running untrusted third-party code in isolated execution environments called Compartments. A flaw in ses versions prior to 1.12.0 allows sensitive top-level variables (defined with let, const, or class) from the host page or extension to leak into the scope accessible by sandboxed third-party code, potentially exposing sensitive data or tokens to attackers.

Technologies: [ses (npm)](https://junglewise.ai/threats/technologies/ses). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2025-32792 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-32792 being exploited in the wild.

**How severe is CVE-2025-32792?** Medium severity, with a CVSS score of 4, published 18 April 2025.

**Which products and versions are affected?** ses (npm) SEMVER:introduced=0,fixed=1.12.0.

**Is there a fix for CVE-2025-32792?** Yes. ses (npm): upgrade to 1.12.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-32792 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-32792?** Check whether you run ses (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- ses (npm): upgrade to 1.12.0 or later

  ```sh
  npm install ses@1.12.0
  ```


## Technical details

The vulnerability is a scope leakage issue (CWE-497) in ses's Compartment API. The sandboxing mechanism uses a with-block and a semi-opaque scope Proxy to isolate third-party code execution. The proxy previously revealed any named property absent from globalThis to the surrounding lexical scope, leaking host-level bindings (let, const, class declarations) into the isolated environment's scope. Web pages and extensions using both ses Compartments and top-level lexical bindings in <script> tags are affected. The vulnerability requires no user interaction or authentication and is network-accessible in web contexts. Patches are available in ses version 1.12.0 and later, which makes the scope proxy fully opaque to prevent this leakage.

## Affected products

- Endo ses <1.12.0

## Identifiers

- CVE-2025-32792
- GHSA-h9w6-f932-gq62

## Timeline

- 2025-04-17: disclosed
- 2025-04-18: patched: ses version 1.12.0 released with fix
- 2025-04-18: advisory

## References

- [https://github.com/endojs/endo/security/advisories/GHSA-h9w6-f932-gq62](https://github.com/endojs/endo/security/advisories/GHSA-h9w6-f932-gq62)

## Related threats

- [Endo SES dynamic import and spread operator sandbox escape](https://junglewise.ai/threats/cve-2023-39532-endo-ses-dynamic-import-and-spread-operator-sandbox-escape)
- [SES TypedArray hardening bypass with non-canonical numeric properties](https://junglewise.ai/threats/ses-typedarray-hardening-bypass-with-non-canonical-numeric-properties-cd848030)
- [realms-shim sandbox breakout via Reflect.construct](https://junglewise.ai/threats/realms-shim-sandbox-breakout-via-reflect-construct-b4a099b5)