Improper Handling of Unicode Encoding Affecting @protobufjs/utf8 package, versions <1.1.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-PROTOBUFJSUTF8-16643215
- published13 May 2026
- disclosed12 May 2026
- creditMalikX
Introduced: 12 May 2026
NewCVE-2026-44288 (opens in a new tab)How to fix?
Upgrade @protobufjs/utf8 to version 1.1.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Unicode Encoding in the decoding of overlong UTF-8 strings. An attacker can bypass application-level byte filtering or validation by sending malicious sequences that decode to canonical characters. This is only exploitable if the application decodes protobuf binary data using the minimal UTF-8 decoder and relies on byte-level filtering before string decoding.