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Vulnerabilities CVE-2026-44293

CVE-2026-44293

High
Open
TLP:CLEAR

protobufjs: Code injection through bytes field defaults in generated toObject code

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Description

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.

Details

CVSS Score
7.7
EPSS Score
0.39%

32.4th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
May 13, 2026
Last Modified
Aug 10, 2026
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