protobufjs: Overlong UTF-8 decoding_CVE-2026-44288

5.3 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a minimal UTF-8 decoder that accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them. An attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters. This vulnerability is fixed in 7.5.6 and 8.0.2.

Basic Information

ID CVE-2026-44288

Source GitHub_M

Published May 13, 2026 at 14:37

Affected Product

Vendor protobufjs

Product protobuf.js

Version < 7.5.6

Affected Versions protobufjs protobuf.js < 7.5.6
protobufjs protobuf.js >= 8.0.0, < 8.0.2

CWE Classification

CWE-176

References

github.com /protobufjs/protobuf.js/security/advisories/GHSA-q6x5-8v7m-xcrf

{
    "lastseen": "",
    "description": "protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs includes a minimal UTF-8 decoder that accepted overlong UTF-8 byte sequences and decoded them to their canonical characters instead of replacing them. An attacker who can provide protobuf binary data decoded through the affected UTF-8 path may be able to bypass application-level checks that inspect raw bytes before protobuf string decoding. For example, bytes that do not contain certain ASCII characters could decode to strings containing those characters. This vulnerability is fixed in 7.5.6 and 8.0.2.",
    "published": "2026-05-13T14:37:26.624Z",
    "modified": "2026-05-13T14:37:26.624Z",
    "type": "cve",
    "title": "protobufjs: Overlong UTF-8 decoding",
    "source": "GitHub_M",
    "references": "https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-q6x5-8v7m-xcrf",
    "id": "CVE-2026-44288",
    "bulletinFamily": "",
    "cwe": [
        "CWE-176"
    ],
    "cvelist": null,
    "sourceData": "protobufjs protobuf.js < 7.5.6\nprotobufjs protobuf.js >= 8.0.0, < 8.0.2",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "protobuf.js",
    "version": "< 7.5.6",
    "vendor": "protobufjs",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}