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CRITICAL severity

CVE-2020-24391 — mongodb-query-parser

CRITICALFix: mongo-express/mongo-express@3a26b07

CVE-2020-24391 is a critical-severity (CVSS 9.8) vulnerability in mongodb-query-parser. EPSS puts its 30-day exploitation probability at 74.5% (99th percentile). A fix is available for mongodb-query-parser — see the affected versions and patch details below.

Remote code execution in mongo-express

Also known asGHSA-hxmg-hm46-cf62
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
74.5%probability of exploitation in next 30 days
Very High Risk0.00%
Lower risk than most CVEs99th percentile — riskier than 99% of all scored CVEsHighest risk
69.0%78.8%88.6%98.4%92.9%74.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-24391 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.

mongodb-query-parsernpm
87Kdownloads / week

Description

mongo-express before 1.0.0 offers support for certain advanced syntax but implements this in an unsafe way. NOTE: this may overlap CVE-2019-10769.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmmongodb-query-parserall versions2.0.0npm install mongodb-query-parser@2.0.0

Affected Products

1 product · 1 configurations
Application
mongo-expressmongo-express_project
≤ 0.54.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mongodb-query-parser, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update mongodb-query-parser to 2.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-24391 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How to detect CVE-2020-24391

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2020-24391 -u https://target
Template
Mongo-Express - Remote Code Execution
Severity
critical
Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
Remediation
Apply the latest security patches or updates provided by the vendor to fix this vulnerability.

Template by ProjectDiscovery nuclei-templates (leovalcante), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

mongo-express before 1.0.0 offers support for certain advanced syntax but implements this in an unsafe way. NOTE: this may overlap CVE-2019-10769.
O3 Security · Impact-Aware SCA

Is CVE-2020-24391 in your dependencies?

Find it across npm, including transitive dependencies.

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CVE-2020-24391: mongodb-query-parser — Fixed in 2.0.0