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CVE-2026-59877

CVE-2026-59877 · protobufjs: Denial of Service via infinite loop in .proto option parsing

This page contains facts from public vulnerability sources. Check the original advisory before updating.

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.

CVSS 5.3 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • protobuf.js

    Versions
    • >= 7.5.0, < 7.6.5: Affected
    • >= 8.0.0, < 8.6.6: Affected

    No fix published

  • protobufjs npm

    Affected ranges
    • SEMVER: ≥ 7.5.0, < 7.6.5

    Update to 7.6.5

  • protobufjs npm

    Affected ranges
    • SEMVER: ≥ 8.0.0, < 8.6.6

    Update to 8.6.6

Original sources

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