CVE-2026-44294: CWE-20: Improper Input Validation in protobufjs protobuf.js
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated JavaScript property accessors from schema-controlled field and oneof names. Certain control characters in field names were not escaped before being embedded into generated function bodies. A crafted schema or JSON descriptor could therefore cause generated encode, decode, verify, or conversion functions to fail during compilation. This vulnerability is fixed in 7.5.6 and 8.0.2.
AI Analysis
Technical Summary
The protobufjs library, used to compile protobuf definitions into JavaScript functions, improperly validates input field names in versions before 7.5.6 and between 8.0.0 and 8.0.2. Specifically, control characters in field or oneof names are not escaped before being embedded into generated function bodies. This can lead to failures in generated encode, decode, verify, or conversion functions during compilation when processing maliciously crafted schemas or JSON descriptors. The vulnerability is identified as CWE-20 (Improper Input Validation) and has a CVSS 3.1 base score of 5.3, indicating a medium severity level. The issue is resolved in protobufjs versions 7.5.6 and 8.0.2.
Potential Impact
This vulnerability causes denial of service by making generated protobuf functions fail during compilation when processing specially crafted input. There is no impact on confidentiality or integrity, only availability is affected. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade protobufjs to version 7.5.6 or later if using the 7.x branch, or to version 8.0.2 or later if using the 8.x branch. Patch status is confirmed by the vendor advisory stating the issue is fixed in these versions. No other mitigation is required.
CVE-2026-44294: CWE-20: Improper Input Validation in protobufjs protobuf.js
Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated JavaScript property accessors from schema-controlled field and oneof names. Certain control characters in field names were not escaped before being embedded into generated function bodies. A crafted schema or JSON descriptor could therefore cause generated encode, decode, verify, or conversion functions to fail during compilation. This vulnerability is fixed in 7.5.6 and 8.0.2.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The protobufjs library, used to compile protobuf definitions into JavaScript functions, improperly validates input field names in versions before 7.5.6 and between 8.0.0 and 8.0.2. Specifically, control characters in field or oneof names are not escaped before being embedded into generated function bodies. This can lead to failures in generated encode, decode, verify, or conversion functions during compilation when processing maliciously crafted schemas or JSON descriptors. The vulnerability is identified as CWE-20 (Improper Input Validation) and has a CVSS 3.1 base score of 5.3, indicating a medium severity level. The issue is resolved in protobufjs versions 7.5.6 and 8.0.2.
Potential Impact
This vulnerability causes denial of service by making generated protobuf functions fail during compilation when processing specially crafted input. There is no impact on confidentiality or integrity, only availability is affected. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade protobufjs to version 7.5.6 or later if using the 7.x branch, or to version 8.0.2 or later if using the 8.x branch. Patch status is confirmed by the vendor advisory stating the issue is fixed in these versions. No other mitigation is required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T17:39:31.113Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a049721cbff5d8610e00ecc
Added to database: 5/13/2026, 3:22:09 PM
Last enriched: 5/13/2026, 3:38:19 PM
Last updated: 5/14/2026, 6:46:03 AM
Views: 5
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