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CVE-2026-44292

protobufjs: Prototype injection in generated message constructors

Published: May 13, 2026Updated: May 13, 2026 Sources: CVE List NVDCWE-1321
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.2%
Top 90.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated message constructors copied enumerable properties from a provided properties object without filtering the __proto__ key. If an application constructed a message from an attacker-controlled plain object, an own enumerable __proto__ property could alter the prototype of that individual message instance. This vulnerability is fixed in 7.5.6 and 8.0.2.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-1321

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

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-fx83-v9x8-x52w
github.com

Timeline

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

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