---
title: "CVE-2026-33863: Convict has prototype pollution via load(), loadFile(), and schema initialization"
url: https://erroneo.us/security/cve/CVE-2026-33863/
description: "CVE-2026-33863 (convict (npm)): Convict has prototype pollution via load(), loadFile(), and schema initialization"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-26
date_modified: 2026-03-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-33863"
kev: false
cvss: 9.4
epss: null
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-33863: Convict has prototype pollution via load(), loadFile(), and schema initialization

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog. That can change quickly after a public write-up; re-check if you are affected.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.
- Only applies if your dependency tree includes convict (npm) <= 6.2.4, fixed in 6.2.5 . Check your lockfile, including transitive dependencies.

## What it is

Convict has prototype pollution via load(), loadFile(), and schema initialization

## Affected packages

- npm `convict` <= 6.2.4 → fixed: 6.2.5

## Severity

- GitHub CVSS 4.0: 9.4 `CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).

## Sources

- [GitHub Advisory GHSA-hf2r-9gf9-rwch](https://github.com/advisories/GHSA-hf2r-9gf9-rwch)
- [CVE.org record CVE-2026-33863](https://www.cve.org/CVERecord?id=CVE-2026-33863)
- [NVD entry CVE-2026-33863](https://nvd.nist.gov/vuln/detail/CVE-2026-33863)
- [github.com](https://github.com/mozilla/node-convict/security/advisories/GHSA-44fc-8fm5-q62h)
- [github.com](https://github.com/mozilla/node-convict/security/advisories/GHSA-hf2r-9gf9-rwch)
- [github.com](https://github.com/mozilla/node-convict/issues/423)

---
Source page: https://erroneo.us/security/cve/CVE-2026-33863/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt