CVE-2026-127056
Published:November 12, 2026
Updated:November 13, 2026
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.
Affected Packages
PapaParse (CDN_JS):
Affected version(s) >=4.0.5 <5.7.1 || >=5.0.0-beta.0 <5.7.1Fix Suggestion:
Update to version 5.7.1https://github.com/mholt/PapaParse.git (GITHUB):
Affected version(s) >=4.0.5 <5.7.1 || >=5.0.0-beta.0 <5.7.1Fix Suggestion:
Update to version 5.7.1papaparse (NPM):
Affected version(s) >=4.0.5 <5.7.1 || >=5.0.0-beta.0 <5.7.1Fix Suggestion:
Update to version 5.7.1Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Algorithmic Complexity
EPSS
Base Score:
0.68