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CVE-2026-109855 undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake

🗓️ 15 Oct 2026 08:12:51Reported by openjsType 
cvelist
 cvelist
🔗 www.cve.org👁 58 Views

Unauthenticated DoS in undici WebSocket client via failed HTTP/2 handshake.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-109855
15 Oct 202608:40
–circl
cve
CVE
CVE-2026-109855
15 Oct 202608:12
–cve
debiancve
Debian CVE
CVE-2026-109855
15 Oct 202608:12
–debiancve
euvd
EUVD
EUVD-2026-101959
27 Oct 202616:09
–euvd
github
Github Security Blog
undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake
27 Oct 202616:09
–github
mend
Mend
CVE-2026-109855
15 Oct 202608:12
–mend
nvd
NVD
CVE-2026-109855
15 Oct 202609:17
–nvd
osv_debian
osv_debian
DEBIAN-CVE-2026-109855
15 Oct 202609:17
–osv_debian
osv_echo
osv_echo
ECHO-C178-9F2B-7F95
29 Oct 202600:00
–osv_echo
osv_ghsa
osv_ghsa
GHSA-QQ8J-7V2V-3RWP undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake
27 Oct 202616:09
–osv_ghsa
Rows per page
[
  {
    "vendor": "undici",
    "product": "undici",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "versionType": "semver",
        "status": "affected",
        "version": "8.11.0",
        "lessThan": "8.11.2"
      },
      {
        "versionType": "semver",
        "status": "unaffected",
        "version": "8.11.2"
      }
    ],
    "packageURL": "pkg:npm/undici"
  }
]

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15 Oct 2026 08:12Current
CVSS 3.17.5
EPSS0.00279
SSVC
58