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CVE-2026-44291

protobufjs: Code generation gadget after prototype pollution

Published: May 13, 2026Updated: May 14, 2026 Sources: CVE List NVDCWE-94
NVD MITRE
8.1CVSSHIGH
EPSS Score
0.4%
Top 72.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

Affected Products

protobuf.jsprotobufjs
Library
OSS Libraries / generic-library
protobufjsprotobufjs project
Library
OSS Libraries / generic-library
protobufjsoss-projectOSS Librariesaka protobuf.js, protobufjs
protobufjs projectoss-projectOSS Librariesaka protobufjs, protobufjs-cli

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-75px-5xx7-5xc7
github.com

Timeline

Published
May 13, 2026
Last Updated
May 14, 2026
News mentions
1

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