What is CVE-2026-54269?

CVE-2026-54269 is a medium-severity vulnerability in Protobufjs Protobuf.js, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-06-22.

How severe is CVE-2026-54269?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Protobufjs Protobuf.js

CVE-2026-54269

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 8.6.0 and 7.6.3, protobufjs accepted certain schema-derived names that could collide with properties used by protobufjs runtime helpers. The known affected n…

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Protobufjs Protobuf.js — versions < 7.6.3, >= 8.0.0, < 8.6.0

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion
CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-54269?: CVE-2026-54269 is a medium-severity vulnerability in Protobufjs Protobuf.js, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-06-22.
How severe is CVE-2026-54269?: Medium severity. CVSS v3 base score is 5.3 out of 10.