CVE-2026-78667CWE-770denial-of-service

CVE-2026-78667

High · published October 9, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
30.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00379 · 30.7th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-10-09T03:17Z
References (4)
https://go.dev/cl/847309 · [email protected]https://go.dev/issue/81858 · [email protected]https://groups.google.com/g/golang-announce/c/U2fTuyDJznI · [email protected]https://pkg.go.dev/vuln/GO-2026-6609 · [email protected]
EPSS history
Timeline
  • 10 OCT 03:31Z
    EPSS moved — → 0%
    epss
  • 08 OCT 22:53Z
    Lack of limit on size of parsed Range headers in net/http
    cvelistv5
  • 08 OCT 22:53Z
    Lack of limit on size of parsed Range headers in net/http
    cvelistv5