High 7.5Published Jul 8, 2026

CVE-2026-59877protobufjs compiles protobuf definitions into JavaScript (JS) functions.

Updated under an hour ago (2026-10-19 10:23 UTC)

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It affects protobufjs_project protobufjs. Add what you run to find out whether that includes you.

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Every CVE for protobufjs_project protobufjs

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-835
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

protobufjs_project protobufjs protobufjs_project:protobufjs	before 7.6.5; from 8.0.0 before 8.6.6	NVD

References

https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217patch
https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69fpatch
https://github.com/protobufjs/protobuf.js/pull/2352issue-tracking, patch
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5product, release-notes
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6product, release-notes
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccwwmitigation, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.