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CVE-2026-115449

3.5 low SSVC exploitation: none Published
NVD · CVE.org

A flaw was found in libslirp. When handling ICMP echo requests, the reply length is not updated to match the actual data received from the host. Under specific conditions where the normal ICMP socket is unavailable, this length mismatch causes the host's real IP address to be leaked to the guest in the echo reply, breaking the NAT isolation that user-mode networking is expected to provide.

Fix

Microsoft's update

  • Release Notes — azl3 libslirp 4.9.3-1 on Azure Linux 3.0 · build 4.9.6-1

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-30.

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 6

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-23 15:00
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-23 16:44
  3. StatusReceived → PublishedNVD modified 2026-10-23 15:00
  4. StatusPublished → ReceivedNVD modified 2026-10-23 15:17
  5. StatusReceived → PublishedNVD modified 2026-10-22 21:20
  6. First seenCVSS 3.5NVD modified 2026-10-22 22:18

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 2