CVE-2026-54270

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-94rc-8x27-4472	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*

History

24 Jun 2026, 20:39

Type	Values Removed	Values Added
First Time		Protobufjs Project protobufjs Protobufjs Project
CPE		cpe:2.3:a:protobufjs_project:protobufjs::::::node.js::*
References	~~() https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-94rc-8x27-4472 -~~	() https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-94rc-8x27-4472 - Mitigation, Vendor Advisory

22 Jun 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-22 18:16

Updated : 2026-06-24 20:39

NVD link : CVE-2026-54270

Mitre link : CVE-2026-54270

CVE.ORG link : CVE-2026-54270

JSON object : View

Products Affected

protobufjs_project

protobufjs

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2026-54270", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54270", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-23T14:47:41.353008Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "protobufjs", "product": "protobuf.js", "versions": [{"status": "affected", "version": ">=8.2.0, < 8.5.0"}]}]}], "published": "2026-06-22T18:16:45.480", "references": [{"url": "https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-94rc-8x27-4472", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-06-24T20:39:18.323", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "A722DAF4-51C8-4165-8DFB-72D52BC31853", "versionEndExcluding": "8.5.0", "versionStartIncluding": "8.2.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}