CVE-2026-92707
Microsoft — MessagePack-CSharp Denial of Service Vulnerability
Patch Tuesday
What EVULNABLE says
An EPSS probability of 0.006, and Publicly disclosed before a patch shipped.
Scheduled Maintenance
The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.
The evidence behind it
| Measure | Value | Source | What it means |
|---|---|---|---|
| CVSS base score | 5.3 | — | How severe the flaw is in itself. It does not say how likely an attack is. |
| FIRST EPSS | 0.006 (50th pctl) | FIRST | FIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. |
| Actively exploited | Not confirmed | Patch Tuesday | Whether a source of record has confirmed attacks using it in the wild. |
| Fixed in | MessagePack: 2.5.303, 3.1.9 | NVD | The version(s) the vendor has published as fixed, where NVD records one. |
| Public exploit module | None known | Metasploit | Module existing is not the same as active exploitation. |
| EUVD cross-reference | Listed | ENISA EUVD | ENISA's own vulnerability database entry for this CVE, where one exists. |
Impacted software or hardware: Not identified by the connected sources
Fixed versions: MessagePack: 2.5.303, 3.1.9
Remediation: Apply the vendor patch or guidance: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-92707
Remediation basis: External remediation intelligence
ENISA EUVD also lists this CVE at CVSS 5.3 (v3.1), assigned by GitHub_M. Source: euvd.enisa.europa.eu.
GitHub Advisory Database, GHSA-qhrr-8q5h-9q3h, lists affected packages:
MessagePack(nuget) affected < 2.5.303, fixed in 2.5.303; affected >= 3.0.0, < 3.1.9, fixed in 3.1.9
Advisory data from GitHub, CC-BY-4.0.
The primary records
This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.
Where this sits
CVE-2026-92707 is one of the entries ranked on the priority feed and in this month's Microsoft release.