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GHSA-2pr8-phx7-x9h3

MediumCVSS 5.3 / 10

Published May 12, 2026·Last modified May 12, 2026

Affected Components(0)

No affected components available

Description

Summary

protobufjs generated JavaScript property accessors from schema-controlled field and oneof names. Certain control characters in field names were not escaped before being embedded into generated function bodies. A crafted schema or JSON descriptor could therefore cause generated encode, decode, verify, or conversion functions to fail during compilation.

Impact

An attacker who can provide or influence a protobuf schema or JSON descriptor may be able to make affected message types unusable by causing protobufjs runtime code generation to throw a syntax error.

This is a denial of service issue for applications that load untrusted schemas or descriptors. Applications that only use trusted, application-defined schemas are not directly affected by this issue.

The issue is not known to allow code execution by itself.

Preconditions

The application must allow an attacker to control or influence a protobuf schema or JSON descriptor.
The crafted input must define a field name containing control characters that reach generated JavaScript property access.
The application must perform an operation that triggers protobufjs code generation for the affected type, such as encode, decode, verify, fromObject, or toObject.

Workarounds

Do not load protobuf schemas or JSON descriptors from untrusted sources with affected versions. If untrusted schemas must be accepted, validate field names before loading them and reject names containing control characters.

Risk Scores

Base Score

5.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the availability of the system.

Threat Intelligence

4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS

0.43%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity

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