How severe is CVE-2026-54271?

CVE-2026-54271 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-54271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54271?

CVE-2026-54271 affects Protobufjs Project Protobufjs-cli. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54271?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-54271 have an EU (EUVD) identifier?

Yes. CVE-2026-54271 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38304.

When was CVE-2026-54271 published?

CVE-2026-54271 was published on 2026-06-22 and last updated on 2026-06-24.

CVE-2026-54271

CVE-2026-54271 is a high-severity vulnerability in Protobufjs Project Protobufjs-cli with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38304
Weakness: CWE-94
Affected product: Protobufjs Project Protobufjs-cli
Published: 2026-06-22
Last modified: 2026-06-24

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.

Frequently asked questions

What is CVE-2026-54271?: 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.
How severe is CVE-2026-54271?: CVE-2026-54271 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-54271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54271?: CVE-2026-54271 affects Protobufjs Project Protobufjs-cli. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54271?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-54271 have an EU (EUVD) identifier?: Yes. CVE-2026-54271 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38304.
When was CVE-2026-54271 published?: CVE-2026-54271 was published on 2026-06-22 and last updated on 2026-06-24.

References

https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-pr59-h9ph-3fr8

Affected products (1)

cpe:2.3:a:protobufjs_project:protobufjs-cli:*:*:*:*:*:node.js:*:*

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