CVE-2026-85063Network attack vector

Prototype replacement via duplicate __proto__ headers

Published Sep 3, 2026 · Updated Sep 4, 2026

Prototype pollution in Adaltas csv-parse before 7.0.2 allows remote attackers to replace parsed record prototypes via crafted CSV headers. In packages/csv-parse/lib/api/index.js, the duplicate-column path treats inherited proto as an existing field and assigns an attacker-controlled array through the prototype setter. Both columns and group_columns_by_name must be enabled; inherited values can evade JSON serialization and alter enumeration or shape checks.

CVSS severity6.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Prototype pollution in Adaltas csv-parse before 7.0.2 allows remote attackers to replace parsed record prototypes via crafted CSV headers. In packages/csv-parse/lib/api/index.js, the duplicate-column path treats inherited proto as an existing field and assigns an attacker-controlled array through the prototype setter. Both columns and group_columns_by_name must be enabled; inherited values can evade JSON serialization and alter enumeration or shape checks.

The record

CVE
CVE-2026-85063
Published
Sep 3, 2026
Updated
Sep 4, 2026
Vendor
Adaltas
Product
Node CSV
Classifications
CWE-915
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adaltas · Node CSVversion=< 7.0.2

Published CVSS scores

6.9SnykCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
6.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo