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CVE-2026-54269— protobufjs: Schema-derived names can shadow runtime-significant properties

Quick assessment

Affected
protobufjs protobuf.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

protobufjs project protobufjs是protobufjs project团队开源的一个ProtocolBuffers解析库。 protobufjs project protobuf.js 8.6.0之前版本和7.6.3之前版本存在安全漏洞，该漏洞源于接受可能冲突运行时间助手的模式派生名称，可能导致确定性异常或递归调用。以下版本受到影响：8.0.0至8.6.0之前版本和7.6.3之前版本。

CVSS 5.3 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
protobufjs protobuf.js < 7.6.3 affected
>= 8.0.0, < 8.6.0 affected
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I. Basic Information for CVE-2026-54269

Vulnerability Information
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Vulnerability Title
protobufjs: Schema-derived names can shadow runtime-significant properties
Source: CVE Program / CVE List V5
Vulnerability Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 8.6.0 and 7.6.3, protobufjs accepted certain schema-derived names that could collide with properties used by protobufjs runtime helpers. The known affected names are fields named hasOwnProperty, field or oneof names such as $type when loaded through protobufjs JSON/reflection descriptors, and service methods whose generated helper name is rpcCall. When affected message or service types were used, protobufjs could read schema-controlled data where it expected an own-property helper, reflected type metadata, or the base RPC helper. This could cause deterministic exceptions or recursive calls in affected decode post-checks, verification, object conversion, reflected JSON serialization, or protobufjs RPC helper invocation. This vulnerability is fixed in 8.6.0 and 7.6.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
protobufjs project protobuf.js 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
protobufjs project protobufjs是protobufjs project团队开源的一个ProtocolBuffers解析库。 protobufjs project protobuf.js 8.6.0之前版本和7.6.3之前版本存在安全漏洞，该漏洞源于接受可能冲突运行时间助手的模式派生名称，可能导致确定性异常或递归调用。以下版本受到影响：8.0.0至8.6.0之前版本和7.6.3之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
protobufjs protobuf.js < 7.6.3 -

II. Public POCs for CVE-2026-54269

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III. Intelligence Information for CVE-2026-54269

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Vendor Advisories for CVE-2026-54269 (1)

Same Patch Batch · protobufjs · 2026-06-22 · 4 CVEs total

CVE-2026-54271 8.2 HIGH protobufjs-cli: Code injection in pbjs static output from crafted JSON descriptor names
CVE-2026-48712 7.5 HIGH protobufjs: Denial of service through unbounded Any expansion during JSON conversion
CVE-2026-54270 5.3 MEDIUM protobufjs: Memory amplification from preserved unknown fields in binary decode

IV. Related Vulnerabilities

Same product: protobuf.js
Same vendor: protobufjs
Same weakness: CWE-674

V. Comments for CVE-2026-54269

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