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Medium, CVSS 6.9amended

node-csv: Prototype replacement still reachable via columns path

CVE-2026-85063GHSA-8cw4-87c7-c6xx

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (csv-parse 7.0.2), redeploy, then verify what is actually installed.

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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-85063: 0.57% estimated exploitation activity in the next 30 days; percentile 47.01 (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.

Impact With columns: true and groupcolumnsbyname: true, a duplicated proto header causes the duplicate-column branch to assign an array to obj['proto'], invoking the proto setter and replacing the parsed record object's prototype with attacker-controlled data. Fixed in 7.0.2 (Object.hasOwn duplicate check + Object.defineProperty assignment). Patches The problem been patched. Workarounds Disable usage of both the columns and groupcolumnsbyname options. References issue #496, PR #497

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-8cw4-87c7-c6xx

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GHSA-8cw4-87c7-c6xx

  4. Revision 1 · created ·

    Published from ghsa record GHSA-8cw4-87c7-c6xx

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-2026-85063

Advisory: node-csv: Prototype replacement still reachable via columns path
IDs: CVE-2026-85063, GHSA-8cw4-87c7-c6xx
Record: https://patchnext.com/advisories/cve-2026-85063 (revision 4, source checked 26 Oct 2026, 13:02 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: csv-parse 7.0.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm csv-parse: affected < 7.0.2; fixed in 7.0.2

## Suggested inspection (read-only)
- `npm ls csv-parse --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on csv-parse.
- 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://github.com/advisories/GHSA-8cw4-87c7-c6xx (GitHub-reviewed advisory GHSA-8cw4-87c7-c6xx lists affected ranges: npm csv-parse >=0 <7.0.2)
- Verified: https://osv.dev/vulnerability/GHSA-8cw4-87c7-c6xx (OSV record GHSA-8cw4-87c7-c6xx lists affected ranges: npm csv-parse >=0 <7.0.2 (fixed))

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