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CVE-2026-99031VulnerabilityPublished Updated

Microsoft · net: bridge: avoid recursive multicast port cleanup

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99031· Medium

Not known to be exploited · fixed in d109141ba14652146089ef78b32d5e4d5285ebad : update Microsoft when convenient.

Data as of 7 Nov 2026, 13:02 UTC

Severity
Medium

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

  1. Disclosed: evidence found.

    CVE published 23 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 8266a0491e92d39dc9af739e8380a0daa9b8836b, < d109141ba14652146089ef78b32d5e4d5285ebad
Fixed in
  • d109141ba14652146089ef78b32d5e4d5285ebad
LinuxLinuxAffected
  • ≥ 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 5158353121bae4f552cb677ce8c5c3ef52f93a0d
Fixed in
  • 5158353121bae4f552cb677ce8c5c3ef52f93a0d
LinuxLinuxAffected
  • ≥ 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 26142868b0767e95e28b7a1237f58b292b54d1d9
Fixed in
  • 26142868b0767e95e28b7a1237f58b292b54d1d9
LinuxLinuxAffected
  • ≥ 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 7931fb9181421953f3133b408b0f2e2b8dd68b61
Fixed in
  • 7931fb9181421953f3133b408b0f2e2b8dd68b61
LinuxLinuxAffected
  • ≥ 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64
Fixed in
  • 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64
LinuxLinuxAffected
  • ≥ 8266a0491e92d39dc9af739e8380a0daa9b8836b, < 6a7385f6605958aa69eeb185c91f45d77640d1e2
Fixed in
  • 6a7385f6605958aa69eeb185c91f45d77640d1e2

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.

References

Community reviews

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