What is CVE-2026-45740?

CVE-2026-45740 is a medium-severity vulnerability in Protobufjs Protobuf.js, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-05-13.

How severe is CVE-2026-45740?

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

Vulnerability in Protobufjs Protobuf.js

CVE-2026-45740

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.8 and 8.2.0, protobufjs could recurse without a depth limit while expanding nested JSON descriptors through Root.fromJSON() and Namespace.addJSON(). A cr…

EPSS: 0.001 (18.5th percentile) — read the EPSS interpretation.

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 < 7.5.8, >= 8.0.0, < 8.2.0
Protobufjs_project Protobufjs

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45740?: CVE-2026-45740 is a medium-severity vulnerability in Protobufjs Protobuf.js, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-05-13.
How severe is CVE-2026-45740?: Medium severity. CVSS v3 base score is 5.3 out of 10.