CVE-2026-44288

5.3 MEDIUM

protobufjs compiles protobuf definitions into JavaScript (JS) functions

Published: 2026-05-13 · Last updated: 2026-05-19

Severity and scoring

CVSS: 5.3 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE: CWE-176

Affected products

Vendor	Product
protobufjs_project	protobufjs

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-44288
[Vendor advisory]https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-q6x5-8v7m-xcrf

Related CVEs

Same vendor

CVE-2026-44295 — protobufjs-cli is the command line add-on for protobuf.js (8.7 HIGH)
CVE-2026-42290 — protobufjs-cli is the command line add-on for protobuf.js (7.8 HIGH)

Same CWE

CVE-2026-45062 — FrankenPHP is a modern application server for PHP (8.1 HIGH)
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