Is protobufjs 8.3 vulnerable?

npm · 1 release from 8.3.0 to 8.3.0 · latest protobufjs is 8.8.1 · checked 1 Nov 2026

Yes: 5 known advisories

Yes. protobufjs 8.3.0, the last 8.3 release, is affected by 5 known security advisories (1 high, 4 medium), including CVE-2026-48712, CVE-2026-59876, CVE-2026-59877. Upgrade to 8.6.6 or later to fix all of them.

Upgrade with:npm install protobufjs@8.6.6

Is your project affected?

Private repo? Upload its lockfile instead, or connect GitHub to check every repo.

Advisories affecting protobufjs 8.3.0

  • MediumCVE-2026-59876GHSA-jfj6-75fj-893420 Jul 2026

    protobufjs: Text Format string map parsing can mutate returned map object prototype

    Affected
    >=8.2.0 <8.6.5
    Fixed in
    8.6.5
  • MediumCVE-2026-59877GHSA-j3f2-48v5-ccww20 Jul 2026

    protobufjs: Denial of Service via infinite loop in .proto option parsing

    Affected
    >=7.5.0 <7.6.5 · >=8.0.0 <8.6.6
    Fixed in
    7.6.5, 8.6.6
  • MediumCVE-2026-54270GHSA-94rc-8x27-447215 Jun 2026

    protobufjs: Memory amplification from preserved unknown fields in binary decode

    Affected
    >=8.2.0 <8.5.0
    Fixed in
    8.5.0
  • HighCVE-2026-48712GHSA-wcpc-wj8m-hjx615 Jun 2026

    protobufjs: Denial of service through unbounded Any expansion during JSON conversion

    Affected
    <7.6.1 · >=8.0.0 <8.4.1
    Fixed in
    7.6.1, 8.4.1
  • MediumCVE-2026-54269GHSA-f38q-mgvj-vph715 Jun 2026

    protobufjs : Schema-derived names can shadow runtime-significant properties

    Affected
    <7.6.3 · >=8.0.0 <8.6.0
    Fixed in
    7.6.3, 8.6.0

Which of your client projects are still on protobufjs 8.3?

NPMscan reads the lockfiles in every GitHub repo you pick, finds the exact protobufjs version each one installs, and checks it against these advisories. Each finding comes with the command that fixes it.

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Other protobufjs versions

Advisory data from OSV.dev (opens OSV.dev in a new tab), which includes the GitHub Advisory Database. Release list from the npm registry. Refreshed daily.