CVE-2026-59877
MEDIUMprotobufjs: Denial of Service via infinite loop in .proto option parsing
Title source: cnaDescription
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.
References (6)
Core 6
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww
X_Refsource_Misc x_refsource_misc
https://github.com/protobufjs/protobuf.js/pull/2352
X_Refsource_Misc x_refsource_misc
https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217
X_Refsource_Misc x_refsource_misc
https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f
X_Refsource_Misc x_refsource_misc
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5
X_Refsource_Misc x_refsource_misc
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6
Scores
CVSS v3
5.3
EPSS
0.0037
EPSS Percentile
29.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-835
Status
published
Products (5)
npm/protobufjs
7.5.0 - 7.6.5npm
npm/protobufjs
8.0.0 - 8.6.6npm
protobufjs/protobuf.js
>= 7.5.0, < 7.6.5
protobufjs/protobuf.js
>= 8.0.0, < 8.6.6
protobufjs_project/protobufjs
< 7.6.5
Published
Jul 08, 2026
Tracked Since
Jul 08, 2026