CVE-2026-107296
LOWDescription
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer while computing the value. Applications that retain or reuse encoded input for integrity checks, logging, or later processing can observe silently corrupted data, while positive integers and other MessagePack value types are unaffected. This issue is fixed in version 6.1.0.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 18% of all known CVEs.
References
Related Vulnerabilities
Other CWE-471 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-21824 | High | 8.2 | 22% | - | Fix |
| CVE-2018-3728 | High | 8.8 | 4.2% | - | Fix |
| CVE-2020-8147 | Critical | 9.8 | 3.1% | - | - |
| CVE-2020-8116 | High | 7.3 | 3.1% | - | Fix |
| CVE-2018-3721 | Medium | 6.5 | 2.4% | - | Fix |
| CVE-2020-26245 | High | 8.1 | 2.2% | - | Fix |
Common questions
How do I fix CVE-2026-107296?
No published fix for CVE-2026-107296 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-107296 being actively exploited?
Not that we know of. CVE-2026-107296 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.28% is the estimated probability that it will be exploited in the next 30 days. That is higher than 18% of all scored CVEs.
How severe is CVE-2026-107296?
CVE-2026-107296 has a CVSS v3 base score of 3.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-08.