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

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Summary

CVECVE-2026-59877
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 16:16:34 UTC
Updated2026-07-08 17:17:26 UTC
Descriptionprotobufjs 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

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

Problem Types: CWE-835 | CWE-835 CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Protobufjs Protobuf.js affected >= 7.5.0, < 7.6.5 Not specified
CNA Protobufjs Protobuf.js affected >= 8.0.0, < 8.6.6 Not specified

References

ReferenceSourceLinkTags
github.com/protobufjs/protobuf.js/pull/2352 [email protected] github.com
github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490... [email protected] github.com
github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5 [email protected] github.com
github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6 [email protected] github.com
github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww [email protected] github.com
github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f372... [email protected] github.com
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