protobufjs protobuf.js up to 7.5.5/8.0.1 prototype pollution

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in protobufjs protobuf.js up to 7.5.5/8.0.1. Affected by this issue is some unknown functionality. The manipulation leads to prototype pollution. This vulnerability is uniquely identified as CVE-2026-44290. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in protobufjs protobuf.js up to 7.5.5/8.0.1. It has been rated as problematic. This issue affects some unknown functionality. The manipulation with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Impacted is availability. The summary by CVE is:

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs allowed certain schema option paths to traverse through inherited object properties while applying options. A crafted protobuf schema or JSON descriptor could cause option handling to write to properties on global JavaScript constructors, corrupting process-wide built-in functionality. This vulnerability is fixed in 7.5.6 and 8.0.2.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-44290 since 05/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 325121 (Linux Distros Unpatched Vulnerability : CVE-2026-44290), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 7.5.6 or 8.0.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (325121). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Prototype pollution
CWE: CWE-1321 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 325121
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-44290

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: protobuf.js 7.5.6/8.0.2

Timelineinfo

05/05/2026 CVE reserved
05/13/2026 +8 days Advisory disclosed
05/13/2026 +0 days VulDB entry created
07/06/2026 +54 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-44290 (🔒)
GCVE (CVE): GCVE-0-2026-44290
GCVE (VulDB): GCVE-100-363617

Entryinfo

Created: 05/13/2026 18:14
Updated: 07/06/2026 20:12
Changes: 05/13/2026 18:14 (63), 07/06/2026 20:12 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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