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Critical

protobufjs Prototype Pollution vulnerability

  • Disclosed: 05.07.2023
  • Updated: 11.10.2026 10:22

protobuf.js (aka protobufjs) 6.10.0 until 6.11.4 and 7.0.0 until 7.2.4 allows Prototype Pollution, a different vulnerability than CVE-2022-25878. A user-controlled protobuf message can be used by an attacker to pollute the prototype of Object.prototype by adding and overwriting its data and functions. Exploitation can involve: (1) using the function parse to parse protobuf messages on the fly, (2) loading .proto files by using load/loadSync functions, or (3) providing untrusted input to the functions ReflectionObject.setParsedOption and util.setProperty. NOTE: this CVE Record is about Object.constructor.prototype.<new-property> = ...; whereas CVE-2022-25878 was about Object.__proto__.<new-property> = ...; instead.

Affected software

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PlatformPackageVulnerable versionsFixed in
npm package protobufjs >= 7.0.0, < 7.2.5, >= 6.10.0, < 6.11.4 7.2.5, 6.11.4

References

CVSS score 9.8/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-1321
Platform
npm
Package
protobufjs
Disclosed
05.07.2023
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-h755-8qp9-cq85 - CC BY 4.0

Vulnerability history: protobufjs

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (17) in the archive
Total entries
17
First → latest
10.2018 07.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 6
  • Medium 9

Disclosures per year

Severity:
  1. protobufjs: Denial of service through unbounded Any expansion during JSON conversion
    High · 7.5 CVE-2026-48712 < 7.6.1, >= 8.0.0, < 8.4.1 7.6.1, 8.4.1
  2. protobuf.js: Code injection through bytes field defaults in generated toObject code
    High CVE-2026-44293 < 7.5.6, >= 8.0.0, < 8.0.2 7.5.6, 8.0.2
  3. protobuf.js: Code generation gadget after prototype pollution
    High · 8.1 CVE-2026-44291 < 7.5.6, >= 8.0.0, < 8.0.2 7.5.6, 8.0.2
  4. protobuf.js: Process-wide denial of service through unsafe option paths
    High · 7.5 CVE-2026-44290 < 7.5.6, >= 8.0.0, < 8.0.2 7.5.6, 8.0.2
  5. protobuf.js: Denial of service through unbounded protobuf recursion
    High · 7.5 CVE-2026-44289 < 7.5.6, >= 8.0.0, < 8.0.2 7.5.6, 8.0.2
  6. Arbitrary code execution in protobufjs
    Critical · 9.8 CVE-2026-41242 >= 8.0.0, < 8.0.1, < 7.5.5 8.0.1, 7.5.5
  7. protobufjs Prototype Pollution vulnerability this entry
    Critical · 9.8 CVE-2023-36665 >= 7.0.0, < 7.2.5, >= 6.10.0, < 6.11.4 7.2.5, 6.11.4
  8. Prototype Pollution in protobufjs
    High · 7.5 CVE-2022-25878 >= 6.11.0, < 6.11.3, >= 6.10.0, < 6.10.3 6.11.3, 6.10.3

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