Inefficient Algorithmic Vulnerability in PapaParse by Mamadou Samba
CVE-2026-127056

8.7HIGH

Key Information:

Vendor

Mholt

Status
Papaparse
Vendor
CVE Published:
12 November 2026

What is CVE-2026-127056?

Prior to version 5.7.1, PapaParse is susceptible to a vulnerability that allows remote unauthenticated attackers to execute a denial of service (DoS) attack. By submitting a specially crafted single-column quoted CSV input devoid of delimiters, attackers can trigger a quadratic growth in resource consumption. This results in extensive CPU usage as the system performs repeated full-buffer indexOf scans for each row of data, ultimately exhausting system resources and causing the Node.js event loop to block or a browser tab to freeze.

Affected Version(s)

PapaParse 0 < 5.7.1

References

https://www.npmjs.com/package/papaparse
patch
https://github.com/mholt/PapaParse/commit/a50fe19aae08b96...
issue-tracking
https://www.vulncheck.com/advisories/papaparse-before-qua...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Muhammadyusuf Dilmurodov (agrresore)
.