What is the CVSS score of CVE-2026-5758?

CVE-2026-5758 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L. EPSS exploitation probability: 0.1%.

Is there a patch available for CVE-2026-5758?

Yes, a patch is available for CVE-2026-5758. Update the affected software to the latest version immediately.

Protocol Buffers Schema Parser CVE-2026-5758

EUVD-2026-22993 MEDIUM

2026-04-15 certcc

RCE Protocol Buffers Schema Parser

6.5

CVSS 3.1 · Vendor: certcc

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This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 26, 2026

Prototype pollution in mafintosh's protocol-buffers-schema 3.6.0 allows remote attackers to inject arbitrary properties into JavaScript objects by supplying a malicious protocol buffer schema definition to the parse function. This can lead to application logic manipulation, security check bypass, denial of service, or remote code execution. Public exploit code exists, but no active exploitation has been confirmed by CISA KEV at this time.

Affected VersionsENISA

Protocol-buffers-schema parser 3.6.0 <3.6.1

Affected Packages

npm protocol-buffers-schema fix: 3.6.1

euvd protocol_buffers_schema_parser fix: 3.6.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in npm, euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (certcc) PRIMARY 6.5 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Red Hat 6.5 MEDIUM

Primary rating from Vendor (certcc).

CVSS VectorVendor: certcc

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Lifecycle Timeline

Patch released

Apr 17, 2026 - 15:17 nvd

Patch available

Apr 16, 2026 - 05:29 EUVD

3.6.1

CVSS changed

Apr 15, 2026 - 20:22 NVD

6.5 (MEDIUM)

CVE Published

Apr 15, 2026 - 17:20 nvd

MEDIUM 6.5

DescriptionCVE.org

JavaScript is vulnerable to prototype pollution in Mafintosh's protocol-buffers-schema Version 3.6.0, where an attacker may alter the application logic, bypass security checks, cause a DoS or achieve remote code execution.

Threat Intelligence Overview

EPSS Score

0.1%

Top 68% exploitable

Data Quality

8 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment Vendor

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.