CVE-2026-127056

HIGH 7.5

PapaParse before 5.7.1 Quadratic-Time Parsing DoS via indexOf Scan

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-407
Vendor	mholt
Product	papaparse
Published	Nov 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

mholt / PapaParse

0 < 5.7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

npmjs.com: https://www.npmjs.com/package/papaparse github.com: https://github.com/mholt/PapaParse/commit/a50fe19aae08b966de444119333fe4a8b7aa6b2f vulncheck.com: https://www.vulncheck.com/advisories/papaparse-before-quadratic-time-parsing-dos-via-indexof-scan

Credits

Muhammadyusuf Dilmurodov (agrresore)