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CVE-2026-59877

33
FAUCET Score

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.

First published: Jul 8, 2026Last modified: Jul 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 7.6.5CPE matchmatch criteria
cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*
>= 8.0.0, < 8.6.6CPE matchmatch criteria
cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 10th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: protobufjsFixed in: 7.6.5
npmpatch availablevia ghsa
Product: protobufjsFixed in: 8.6.6

Vendor Advisories (1)

npmGHSA-j3f2-48v5-ccwwmedium

protobufjs: Denial of Service via infinite loop in .proto option parsing

Jul 20, 2026

References

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