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CVE-2026-59877

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

Published: Jul 8, 2026Updated: Jul 10, 2026 Sources: CVE List NVDCWE-835
5.3MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 70.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-835

Affected Products

protobufjs project
oss-projectaka protobufjs-cli, protobufjs
protobufjsLibrary
OSS Libraries / generic-library
protobufjs
oss-projectaka protobuf.js
protobuf.jsLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
Workaround Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217
github.com
https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f
github.com
https://github.com/protobufjs/protobuf.js/pull/2352
github.com
and 3 more references View all →

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