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Vulnerability record · CVE-2026-59877 · published 8 July 2026

CVE-2026-59877: Protobufjs project protobufjs vulnerability

PProtobufjs Project · Protobufjs

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.

7.5 CVSS 3.1 High EPSS 0.67% · top 49.8% CWE-835 · CWE-835
7.5CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
10 Jul 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217 Patch
https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f Patch
https://github.com/protobufjs/protobuf.js/pull/2352 Issue TrackingPatch
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5 ProductRelease Notes
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6 ProductRelease Notes
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww MitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-59877), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.