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CVE-2026-44293

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

Published: May 13, 2026Updated: Sep 7, 2026 Sources: CVE List NVDCWE-94
8.8HIGH
NVD MITRE
EPSS Score
0.4%
Top 66.0%
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 7.5.6 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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

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
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-66ff-xgx4-vchm
github.com
https://access.redhat.com/errata/RHSA-2026:26090
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:26234
access.redhat.com
and 12 more references View all →

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