CVE-2026-127056
PapaParse before 5.7.1 Quadratic-Time Parsing DoS via indexOf Scan
PapaParse before 5.7.1 contains an inefficient algorithmic complexity vulnerability that allows remote unauthenticated attackers to cause denial of service by submitting delimiter-free quoted CSV input to Papa.parse(). Attackers can supply a single-column quoted CSV with no delimiters, triggering repeated full-buffer indexOf scans per row that grow quadratically with input size, exhausting CPU and blocking the Node.js event loop or freezing a browser tab.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| PapaParse mholt papaparse
npm |
≥ 0; < 5.7.1 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.7 high |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://www.npmjs.com/package/papaparseCNA: VulnCheck · patch
- https://github.com/mholt/PapaParse/commit/a50fe19aae08b966de444119333fe4a8b7aa6b2fCNA: VulnCheck · issue-tracking
- https://www.vulncheck.com/advisories/papaparse-before-quadratic-time-parsing-dos-via-indexof-scanCNA: VulnCheck · third-party-advisory
For agents and automation
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