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openssl 1.0.2h vulnerabilities

CVE-2016-6303

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • runtime node

    Affected
    >= 6.0.0, < 6.7.0>= 5.0.0, < 6.0.0>= 4.0.0, < 4.6.0
    Fixed in
    6.7.0, 4.6.0

Sources

  • nodejs.org runtime security intelligence

    The nodejs.org release index dates the first patched release for CVE-2016-6303 to 2016-09-27.

    VerifiedObserved Official nodejs.org release index (dist/index.json).

  • raw.githubusercontent.com runtime security intelligence

    Node.js security working group core entry 14 lists CVE-2016-6303 affecting node >=6.0.0 =5.0.0 =4.0.0 <4.6.0

    VerifiedObserved Structured Node.js security-wg core vulnerability record maintained by the Node.js project.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
  • CVE-2016-6303: 31.99% estimated exploitation activity in the next 30 days; percentile 98.31 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

An overflow can occur in MDC2_Update() under certain circumstances resulting in an out of bounds (OOB) error. This attack is impractical on most platforms due to the size of data required to trigger the OOB error. Node.js is impacted by this flaw but due to the impracticalities of exploiting it and the very low usage of of MDC-2, it is very low severity for Node.js users.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · published ·

    Published from vendor_advisory record nodejs-security-wg:core:14

  2. Revision 1 · created ·

    Created from vendor_advisory record nodejs-security-wg:core:14

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2016-6303

Advisory: openssl 1.0.2h vulnerabilities
IDs: CVE-2016-6303
Record: https://patchnext.com/advisories/cve-2016-6303 (revision 2, source checked 26 Oct 2026, 16:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: node 6.7.0, 4.6.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- runtime node: affected >= 6.0.0, < 6.7.0; >= 5.0.0, < 6.0.0; >= 4.0.0, < 4.6.0; fixed in 6.7.0, 4.6.0

## Suggested inspection (read-only)
- runtime node: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on node.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://nodejs.org/dist/index.json (The nodejs.org release index dates the first patched release for CVE-2016-6303 to 2016-09-27.)
- Verified: https://raw.githubusercontent.com/nodejs/security-wg/main/vuln/core/14.json (Node.js security working group core entry 14 lists CVE-2016-6303 affecting node >=6.0.0 =5.0.0 =4.0.0 <4.6.0)

Commands are suggestions: review each one before running it.

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