CVE-2026-78669 HTTP/2 - Denial of Service

HTTP/2 protocol contains a denial of service vulnerability caused by excessive CPU consumption from many small SETTINGS frames with SETTINGS_INITIAL_WINDOW_SIZE values, letting malicious peers cause resource exhaustion, exploit requires a malicious HTTP/2 peer.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.57% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-405

Vendor fix

Update to the latest version with HTTP/2 protocol fixes.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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