CVE-2026-54270

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Source
https://cve.org/CVERecord?id=CVE-2026-54270
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54270.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54270
Aliases
Downstream
CGA (22)
CLEANSTART (1)
MINI (1)
ROOT (1)
Published
2026-06-22T16:19:20Z
Modified
2026-10-28T02:30:39Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
protobufjs: Memory amplification from preserved unknown fields in binary decode
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54270.json"
}
References

Affected packages

Git / github.com/protobufjs/protobuf.js

Affected ranges

Type
GIT
Repo
https://github.com/protobufjs/protobuf.js
Events
Introduced
f8d5f3fe7104fade45407341228f0f0bb623e76d
Fixed
4655f8d0a326014fd4c4eb85df39a1837673b28a
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "8.2.0"
                },
                {
                    "fixed": "8.5.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "cpe": "cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*",
            "range": [
                {
                    "introduced": "8.2.0"
                },
                {
                    "fixed": "8.5.0"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}

Affected versions

protobufjs-cli-v2.*
protobufjs-cli-v2.2.0
protobufjs-cli-v2.2.1
protobufjs-cli-v2.3.0
protobufjs-cli-v2.4.0
protobufjs-cli-v2.4.1
protobufjs-cli-v2.4.2
protobufjs-v8.*
protobufjs-v8.2.0
protobufjs-v8.2.1
protobufjs-v8.3.0
protobufjs-v8.4.0
protobufjs-v8.4.1
protobufjs-v8.4.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54270.json"