HIGH

CVE-2026-78667

CVSS v3

7.5

HIGH

EPSS Score

—

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-10-08
Last Modified: 2026-10-09

Frequently asked questions

What is CVE-2026-78667?

When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.

Is CVE-2026-78667 actively exploited?

Active exploitation of CVE-2026-78667 has not been confirmed.

What is the CVSS score for CVE-2026-78667?

CVE-2026-78667 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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