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CVE-2026-55991

🗓️ 22 Jul 2026 13:10:13Reported by NLnet LabsType 
cve
 cve
🔗 web.nvd.nist.gov👁 196 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
alpinelinux
AlpineLinux
CVE-2026-55991
22 Jul 202613:10
–alpinelinux
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
debian
Debian
[SECURITY] [DSA 6507-1] unbound security update
19 Sep 202615:00
–debian
debiancve
Debian CVE
CVE-2026-55991
22 Jul 202613:10
–debiancve
nessus
Tenable Nessus
Debian dsa-6507 : libunbound-dev - security update
21 Sep 202600:00
–nessus
nessus
Tenable Nessus
Fedora 43 : unbound (2026-3170ee6a1c)
31 Jul 202600:00
–nessus
nessus
Tenable Nessus
Fedora 44 : unbound (2026-e495bd59ef)
30 Jul 202600:00
–nessus
Rows per page
NVD
Node
nlnetlabsunboundRange1.22.0–1.25.2
[
  {
    "defaultStatus": "unaffected",
    "product": "Unbound",
    "vendor": "NLnet Labs",
    "versions": [
      {
        "lessThan": "1.25.2",
        "status": "affected",
        "version": "1.22.0",
        "versionType": "semver"
      }
    ]
  }
]

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24 Oct 2026 13:10Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.9
EPSS0.00365
SSVC
196