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CVE-2026-54270— protobufjs: Memory amplification from preserved unknown fields in binary decode

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 8.2.0版本至8.4.2版本存在资源管理错误漏洞，该漏洞源于保留未知有线元素时未提供解码时选项丢弃未知字段，可能导致特制的有效载荷占用大量内存。

CVSS 5.3 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
protobufjs protobuf.js >=8.2.0, < 8.5.0 affected
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I. Basic Information for CVE-2026-54270

Vulnerability Information
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Vulnerability Title
protobufjs: Memory amplification from preserved unknown fields in binary decode
Source: CVE Program / CVE List V5
Vulnerability Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 to 8.4.2, protobufjs preserved unknown wire elements in message.$unknowns and did not provide a decode-time option to discard unknown fields before retaining them. A crafted protobuf payload containing many unknown fields could therefore cause a decoded message to retain substantially more memory than the input size would suggest, even when unknown-field round-tripping is not needed. protobufjs 8.5.0 added the relevant decode-time options, allowing applications that decode untrusted protobuf data to disable unknown-field retention during decode. protobufjs 8.6.2 flips the default so unknown fields are discarded unless explicitly opted into.
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
不加限制或调节的资源分配
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 8.2.0版本至8.4.2版本存在资源管理错误漏洞，该漏洞源于保留未知有线元素时未提供解码时选项丢弃未知字段，可能导致特制的有效载荷占用大量内存。
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 >=8.2.0, < 8.5.0 -

II. Public POCs for CVE-2026-54270

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III. Intelligence Information for CVE-2026-54270

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Vendor Advisories for CVE-2026-54270 (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-2026-54269 5.3 MEDIUM protobufjs: Schema-derived names can shadow runtime-significant properties

IV. Related Vulnerabilities

Same product: protobuf.js
Same vendor: protobufjs
Same weakness: CWE-770

V. Comments for CVE-2026-54270

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