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CRITICAL severity

CVE-2021-3666 — body-parser-xml

CRITICALFix: fiznool/body-parser-xml@d46ca62

CVE-2021-3666 is a critical-severity (CVSS 9.8) CWE-1321 vulnerability in body-parser-xml. 1 public exploit reference exists, so weaponization risk is real. A fix is available for body-parser-xml — see the affected versions and patch details below.

body-parser-xml vulnerable to Prototype Pollution

Also known asGHSA-2ghc-6v89-pw9j
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs70th percentile — riskier than 70% of all scored CVEsHighest risk
0.00%0.60%1.20%1.80%0.4%1.3%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-3666 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% 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, and reverse-dependency count shows how many other packages break if it stays unpatched.

58other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
body-parser-xmlnpm
106Kdownloads / week

Description

body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmbody-parser-xmlall versions2.0.3npm install body-parser-xml@2.0.3

Affected Products

1 product · 1 configurations
Application
xml body parserxml_body_parser_project
< 2.0.3
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

body-parser-xml is vulnerable to Improperly Controlled Modification of O…

huntr.devNVDSep 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update body-parser-xml to 2.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-3666 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.

Frequently Asked Questions

body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
O3 Security · Impact-Aware SCA

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CVE-2021-3666: body-parser-xml — Fixed in 2.0.3