adaltas/node-csv · Security
node-csv: Prototype replacement still reachable via columns path
- GHSA ID
- GHSA-8cw4-87c7-c6xx
- CVE ID
- CVE-2026-85063
- Severity
- medium
- Published
- Updated
- CVSS v4
- 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
Description
Impact
With columns: true and group_columns_by_name: 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 group_columns_by_name options.
References
issue #496, PR #497
CWEs
- CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
- https://github.com/adaltas/node-csv/security/advisories/GHSA-8cw4-87c7-c6xx ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-85063 ↗
- https://github.com/adaltas/node-csv/issues/496 ↗
- https://github.com/adaltas/node-csv/pull/497 ↗
- https://github.com/adaltas/node-csv/commit/eb4d1484589c976dcb977db8dd0b90e015a6f66e ↗
- https://github.com/advisories/GHSA-8cw4-87c7-c6xx ↗