PapaParse before 5.7.1 contains an inefficient algorithmic complexity vulnerability that allows remote unauthenticated
Source GCVE Database
Not known to be exploited · CVSS 8.7 High : upgrade to 5.7.1 soon.
Data as of 12 Nov 2026, 16:47 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 8.7 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 7.5 |
- Patch
- Available – fixed in 5.7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 12 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.
What to do
Upgrade PapaParse to 5.7.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| mholtPapaParse | Affected
| Fixed in
|
npmPapaParsepkg:npm/PapaParseOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in PapaParse version 5.7.1. Users should upgrade to version 5.7.1 or later to remediate this vulnerability. No other mitigation actions are indicated.
Description
PapaParse versions before 5.7.1 have an inefficient algorithmic complexity vulnerability that allows remote unauthenticated attackers to cause denial of service. This occurs when attackers submit delimiter-free quoted CSV input to the Papa.parse() function, triggering repeated full-buffer scans that grow quadratically with input size. The result is CPU exhaustion and blocking of the Node.js event loop or freezing of browser tabs.
References
- nvd.nist.gov/vuln/detail/CVE-2026-127056 (opens in a new tab)
- github.com/mholt/PapaParse/commit/a50fe19aae08b966de444119333fe4a8b7aa6b2f (opens in a new tab)
- npmjs.com/package/papaparse (opens in a new tab)
- vulncheck.com/advisories/papaparse-before-quadratic-time-parsing-dos-via-indexof-scan (opens in a new tab)