VDB

CVE-2026-97206

CVE-2026-97206 PUBLISHED CVSS 7.5 HIGH

Reported by NLnet Labs · Published October 21, 2026

NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash.

Risk Scores

CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

VendorProductVersions
NLnet LabsUnbound1.22.0
NLnet LabsUnbound1.22.0
alpineunbound0

Timeline

  • Oct 21, 2026 EPSS Score
  • Oct 21, 2026 CVE Published
  • Oct 25, 2026 EPSS Score
  • Oct 29, 2026 EPSS Score

References

  • vendor-advisory
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