CVE-2026-44290: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in protobufjs protobuf.js
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.
AI Analysis
Technical Summary
protobuf.js, a library that compiles protobuf definitions into JavaScript functions, improperly controls modification of object prototype attributes (CWE-1321). Specifically, before versions 7.5.6 and 8.0.2, certain schema option paths could traverse inherited object properties during option application, enabling crafted inputs to write to properties on global JavaScript constructors. This prototype pollution can corrupt process-wide built-in functionality. The vulnerability is tracked as CVE-2026-44290 and has a CVSS 3.1 score of 7.5 (high severity).
Potential Impact
Exploitation of this vulnerability can lead to corruption of global JavaScript constructor properties, which may disrupt or alter process-wide built-in functionality. The CVSS vector indicates the attack can be performed remotely without privileges or user interaction, and while confidentiality and integrity are not impacted, availability is affected. No known exploits in the wild have been reported.
Mitigation Recommendations
This vulnerability is fixed in protobuf.js versions 7.5.6 and 8.0.2. Users should upgrade to these or later versions to remediate the issue. Patch status is confirmed by the version information provided. No additional vendor advisory content is available, so check official protobuf.js release notes for confirmation and further guidance.
CVE-2026-44290: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in protobufjs protobuf.js
Description
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.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
protobuf.js, a library that compiles protobuf definitions into JavaScript functions, improperly controls modification of object prototype attributes (CWE-1321). Specifically, before versions 7.5.6 and 8.0.2, certain schema option paths could traverse inherited object properties during option application, enabling crafted inputs to write to properties on global JavaScript constructors. This prototype pollution can corrupt process-wide built-in functionality. The vulnerability is tracked as CVE-2026-44290 and has a CVSS 3.1 score of 7.5 (high severity).
Potential Impact
Exploitation of this vulnerability can lead to corruption of global JavaScript constructor properties, which may disrupt or alter process-wide built-in functionality. The CVSS vector indicates the attack can be performed remotely without privileges or user interaction, and while confidentiality and integrity are not impacted, availability is affected. No known exploits in the wild have been reported.
Mitigation Recommendations
This vulnerability is fixed in protobuf.js versions 7.5.6 and 8.0.2. Users should upgrade to these or later versions to remediate the issue. Patch status is confirmed by the version information provided. No additional vendor advisory content is available, so check official protobuf.js release notes for confirmation and further guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T17:39:31.112Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a049717cbff5d8610e0032b
Added to database: 05/13/2026, 15:21:59 UTC
Last enriched: 05/20/2026, 18:48:00 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 77
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