Skip to main content
CVE-2026-127056VulnerabilityPublished

PapaParse before 5.7.1 contains an inefficient algorithmic complexity vulnerability that allows remote unauthenticated

Source GCVE Database

0
Compare
Authoritative record:CVE-2026-127056· High 8.7

Not known to be exploited · CVSS 8.7 High : upgrade to 5.7.1 soon.

Data as of 12 Nov 2026, 16:47 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.08.7
CNA (VulnCheck)CVSS 3.17.5
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
mholtPapaParseAffected
  • <5.7.1
Fixed in
  • 5.7.1
npmPapaParsepkg:npm/PapaParseOther threatsAffected
  • <5.7.1
Fixed in
  • 5.7.1

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

Community reviews

Loading reviews…