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CVE-2026-107302

7.5 · HIGH

msgpack5 is a msgpack v5 implementation for node.js and the browser.

Published Oct 8, 2026CWE-125EPSS 0.52%

Overview

CVE-2026-107302 is a high-severity vulnerability. It was published on October 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefore causes a checked out-of-bounds buffer read and throws RangeError instead of IncompleteBufferError, which can unexpectedly terminate a request, stream, or worker in applications that wait for additional bytes after IncompleteBufferError. There is no adjacent-memory disclosure because the buffer implementation checks bounds. This issue is fixed in version 6.1.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mcollina/msgpack5/commit/15443a1f2aa682a6aa37f1705ac628de5b866ad1GitHubgithub.com/mcollina/msgpack5/releases/tag/v6.1.0GitHubgithub.com/mcollina/msgpack5/security/advisories/GHSA-8f34-f56x-9xph

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107302?

CVE-2026-107302 is a high-severity vulnerability. It was published on October 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-107302?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-107302?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-107302?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107302 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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