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CVE-2026-44291

⚠️ high
🔍 Scan for this CVE
Summary

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. This vulnerabilit

Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. This vulnerability is fixed in 7.5.6 and 8.0.2.

CVSS Score
8.1
High
EPSS Score
0.1
Exploit Probability
Published Date
2026-05-13
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 77.6% of all 321,566 vulnerabilities in our database.

#72,014
Top 25% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 13, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
SSVC data provided by CISA
Last Modified 2026-05-14
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE IDs (Weakness Types)
CWE-94

📦 Affected Products 2

Vendor Product Status Affected Versions
protobufjs_project protobufjs Affected
< 7.5.6
protobufjs_project protobufjs Affected
> 8.0.0 < 8.0.2

🔗 References 1

https://github.com/protobufjs/protobuf.js/security/a...
Mitigation Vendor Advisory

🔗 Related CVEs 5

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-44290 ⚠️ high 7.5 0.1 protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs allowed ce... 2026-05-13
CVE-2026-44288 🔶 medium 5.3 0.0 protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a... 2026-05-13
CVE-2023-36665 ⛔ critical 9.8 1.7 "protobuf.js (aka protobufjs) 6.10.0 through 7.x before 7.2.5 allows Prototype Pollution, a different vulnerability than... 2023-07-05
CVE-2022-25878 ⚠️ high 8.2 0.4 The package protobufjs before 6.11.3 are vulnerable to Prototype Pollution which can allow an attacker to add/modify pro... 2022-05-27
CVE-2018-3738 🔶 medium 5.5 0.2 protobufjs is vulnerable to ReDoS when parsing crafted invalid .proto files. 2018-06-07
These CVEs affect the same products