CVE-2026-44293
HIGHprotobufjs: Code injection through bytes field defaults in generated toObject code
Title source: cnaDescription
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated JavaScript for toObject conversion could include an unsafe expression derived from a schema-controlled bytes field default value. A crafted descriptor with a non-string default value for a bytes field could cause attacker-controlled code to be emitted into the generated conversion function. This vulnerability is fixed in 7.5.6 and 8.0.2.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-66ff-xgx4-vchm
Scores
CVSS v3
8.8
EPSS
0.0029
EPSS Percentile
20.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-94
Status
published
Products (3)
protobufjs/protobuf.js
< 7.5.6
protobufjs/protobuf.js
>= 8.0.0, < 8.0.2
protobufjs_project/protobufjs
< 7.5.6
Published
May 13, 2026
Tracked Since
May 13, 2026