CVE-2026-51785

critical

Description

An issue in Hugo Leisink Hiawatha v.12.1 and before allows a remote attacker to execute arbitrary code via a crafted request

References

https://www.rfc-editor.org/rfc/rfc9112.html#section-6.3

https://www.rfc-editor.org/rfc/rfc2616.html#section-4.4

https://www.rfc-editor.org/rfc/rfc2616

https://fenrisk.com/hiawatha-http-smuggling

Details

Source: Mitre, NVD

Published: 2026-07-31

Updated: 2026-08-31

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.01149