Microsoft · net: bridge: avoid recursive multicast port cleanup
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in d109141ba14652146089ef78b32d5e4d5285ebad : update Microsoft when convenient.
Data as of 7 Nov 2026, 13:02 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in d109141ba14652146089ef78b32d5e4d5285ebad, 5158353121bae4f552cb677ce8c5c3ef52f93a0d, 26142868b0767e95e28b7a1237f58b292b54d1d9 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 7 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Description
CVE-2026-99031 is a vulnerability related to the network bridge component in Microsoft software versions 3.0 and 4.0. The issue concerns recursive multicast port cleanup, which may lead to unintended behavior in network traffic handling. No CVSS score or detailed impact information is provided.