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OpenAdvisories
Medium · 5.3 CVE-2026-44288 EUVD-2026-30026GHSA-q6x5-8v7m-xcrf

protobufjs: Overlong UTF-8 decoding

Published May 13, 2026 · Updated May 13, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
protobufjs protobuf.js < 7.5.6, >= 8.0.0, < 8.0.2 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling kubeflow-centraldashboard 1.10.0-r21 —
Wolfi rolling pulumi-language-nodejs 3.237.0-r1 —
Wolfi rolling renovate 43.170.15-r2 —
Wolfi rolling vitess-23 23.0.4-r5 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @protobufjs/utf8 < 1.1.1 1.1.1 GHSA-q6x5-8v7m-xcrf
npm protobufjs < 7.5.6 7.5.6 GHSA-q6x5-8v7m-xcrf
npm protobufjs >= 8.0.0, < 8.0.2 8.0.2 GHSA-q6x5-8v7m-xcrf

References