Is CVE-2026-54271 actively exploited?

No active exploitation of CVE-2026-54271 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54271 be exploited remotely?

Yes. CVE-2026-54271 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54271?

CVE-2026-54271 has a CVSS score of 8.2 (HIGH).

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HIGH

CVE-2026-54271

CWE-94Published: June 22, 2026· Updated: Jun 24, 2026

8.2

CVSS v3.1

EPSS:0.24%probability of exploitation in 30 daysPercentile:14.9th

Official Description

protobufjs-cli is the command line add-on for protobuf.js. Prior to 1.3.2 and 2.5.0, a previous fix for unsafe name handling in pbjs static / static-module code generation was incomplete. Affected versions of protobufjs-cli could still emit unsafe JavaScript references when generating static output from crafted JSON descriptor input. The common case of parsing schemas from .proto files is not affected. This is a bypass of CVE-2026-44295. An attacker who can provide or influence pre-parsed JSON descriptors passed to pbjs static code generation may be able to cause generated JavaScript output to contain attacker-controlled code. The injected code may execute if the generated file is later executed or imported and an affected generated API path is invoked. This vulnerability is fixed in 1.3.2 and 2.5.0.

NVD Source

Technical Analysis

CVE-2026-54271 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.2.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.