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CVE-2026-55991

🗓️ 22 Jul 2026 13:10:13Reported by NLnet LabsType 
cve
 cve
🔗 web.nvd.nist.gov👁 146 Views

Remote unauthenticated DoQ client can crash Unbound with a single query due to invalid error handling in libngtcp2.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-55991
22 Jul 202613:10
attackerkb
cbl_mariner
CBLMariner
CVE-2026-55991 affecting package unbound for versions less than 1.25.2-1
23 Jul 202620:32
cbl_mariner
circl
Circl
CVE-2026-55991
22 Jul 202613:52
circl
cvelist
Cvelist
CVE-2026-55991 Remote DNS-over-QUIC (DoQ) flow-control assertion failure in libngtcp2
22 Jul 202613:10
cvelist
debiancve
Debian CVE
CVE-2026-55991
22 Jul 202613:10
debiancve
euvd
EUVD
EUVD-2026-47683
22 Jul 202613:10
euvd
freebsd
FreeBSD
unbound -- multiple vulnerabilities
22 Jul 202600:00
freebsd
fedora
Fedora
[SECURITY] Fedora 43 Update: unbound-1.25.2-1.fc43
31 Jul 202601:15
fedora
fedora
Fedora
[SECURITY] Fedora 44 Update: unbound-1.25.2-1.fc44
30 Jul 202601:18
fedora
nessus
Tenable Nessus
Fedora 43 : unbound (2026-3170ee6a1c)
31 Jul 202600:00
nessus
Rows per page
NVD
Node
nlnetlabsunboundRange1.22.01.25.2
[
  {
    "vendor": "NLnet Labs",
    "product": "Unbound",
    "versions": [
      {
        "version": "1.22.0",
        "status": "affected",
        "lessThan": "1.25.2",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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24 Jul 2026 14:25Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.15.9
EPSS0.00237
SSVC
146