Skip to main content

Prototype Pollution CVE-2026-90771

| EUVDEUVD-2026-76992 MEDIUM
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-09-13 VulnCheck GHSA-wr44-6hxh-3jwq
Information Disclosure Prototype Pollution Joi
6.3
CVSS 4.0 · Vendor: VulnCheck
Share

Severity by source

Vendor (VulnCheck) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Sep 13, 2026 - 11:27 vuln.today
Analysis Generated
Sep 13, 2026 - 11:27 vuln.today

DescriptionCVE.org

joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code. Attackers can supply __proto__ keys in custom messages to replace the returned object's prototype, breaking downstream code relying on Object.prototype methods.

AnalysisAI

Prototype pollution in hapijs/joi's messages compilation function allows network-reachable attackers to replace an object's prototype chain by supplying __proto__ as an error-code key in custom validation messages. Affected versions are joi before 17.13.8 and before 18.2.9. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Prototype Pollution

View all
CVE-2026-34621 HIGH POC
8.6 Apr 11

Prototype pollution in Adobe Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier enables arbitrary code execu
CVE-2024-56059 CRITICAL
9.8 Dec 18

Prototype pollution in the farinspace Partners WordPress plugin (versions up to and including 0.2.0) enables remote unau
CVE-2020-28271 CRITICAL POC
9.8 Nov 12

Prototype pollution vulnerability in 'deephas' versions 1.0.0 through 1.0.5 allows attacker to cause a denial of service
CVE-2023-38894 CRITICAL POC
9.8 Aug 16

A Prototype Pollution issue in Cronvel Tree-kit v.0.7.4 and before allows a remote attacker to execute arbitrary code vi
CVE-2024-24292 CRITICAL POC
9.8 Mar 28

A Prototype Pollution issue in Aliconnect /sdk v.0.0.6 allows an attacker to execute arbitrary code via the aim function
CVE-2023-26121 CRITICAL POC
10.0 Apr 11

All versions of the package safe-eval are vulnerable to Prototype Pollution via the safeEval function, due to improper s
CVE-2021-23449 CRITICAL POC
10.0 Oct 18

This affects the package vm2 before 3.9.4 via a Prototype Pollution attack vector, which can lead to execution of arbitr
CVE-2024-39011 CRITICAL POC
9.8 Jul 30

Prototype Pollution in chargeover redoc v2.0.9-rc.69 allows attackers to execute arbitrary code or cause a Denial of Ser
CVE-2024-38988 CRITICAL POC
9.8 Mar 28

alizeait unflatto <= 1.0.2 was discovered to contain a prototype pollution via the method exports.unflatto at /dist/inde
CVE-2025-57347 CRITICAL POC
9.8 Sep 24

A vulnerability exists in the 'dagre-d3-es' Node.js package version 7.0.9, specifically within the 'bk' module's addConf
CVE-2025-57321 CRITICAL POC
9.8 Sep 24

A Prototype Pollution vulnerability in the util-deps.addFileDepend function of magix-combine-ex versions thru 1.2.10 all
CVE-2024-45435 CRITICAL POC
9.8 Aug 29

Chartist 1.x through 1.3.0 allows Prototype Pollution via the extend function. Rated critical severity (CVSS 9.8), this

Same weakness CWE-1321 – Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

View all
CVE-2026-34621 HIGH POC
8.6
CVE-2024-56059 CRITICAL
9.8
CVE-2020-28271 CRITICAL POC
9.8
CVE-2023-38894 CRITICAL POC
9.8
CVE-2024-24292 CRITICAL POC
9.8
CVE-2023-26121 CRITICAL POC
10.0
CVE-2021-23449 CRITICAL POC
10.0
CVE-2024-39011 CRITICAL POC
9.8

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Share

CVE-2026-90771 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy