Affects Microsoft .NET Framework — a widely deployed enterprise runtime; network-based privilege escalation could impact many organizations.
CVE-2026-85363
Integer overflow in .NET enables network-based privilege escalation.
Is CVE-2026-85363 being exploited?
Not confirmed. CVE-2026-85363 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.74% probability of exploitation in the next 30 days.
How severe is CVE-2026-85363?
CVE-2026-85363 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-85363?
Yes. A fix has been recorded for CVE-2026-85363. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-85363 affect?
CVE-2026-85363 affects .NET Framework (affected versions per MSRC advisory), Windows hosts running .NET applications and services. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-85363?
Apply Microsoft updates when available; restrict network access to .NET services; monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote integer overflow in .NET allows attackers to elevate privileges to Administrator/SYSTEM over the network.
Patch when possible
- affected>= 3.5.0 and < 2.0.50727.9188 AND 3.0.30729.9171
- affected>= 3.0.0.0 and < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
- affected>= 4.7.0 and < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
- affected>= 4.8.0 and < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
- affected>= 4.8.1 and < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
- affected>= 4.7.0 and < 4.7.4150.0
- affected>= 4.8.0 and < 4.8.4811.0
- affected>= 4.8.0.0 and < 4.8.9363.0
- affected>= 17.14.0 and < 17.14.42
- affected>= 18.10.0 and < 18.10.4
- affected>= 10.0.0 and < 10.0.13
- affected>= 11.0.0 and < 11.0.0-rc.2
- affected>= 8.0.0 and < 8.0.32
- affected>= 9.0.0 and < 9.0.21
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.