CVE-2026-51785CWE-94code-injection

CVE-2026-51785

Critical · published August 1, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
66.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01149 · 66.6th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-08-01T01:17Z
References (5)
https://fenrisk.com/hiawatha-http-smuggling · [email protected]https://www.rfc-editor.org/rfc/rfc2616 · [email protected]https://www.rfc-editor.org/rfc/rfc2616.html#section-4.4 · [email protected]https://www.rfc-editor.org/rfc/rfc9112.html#section-6.3 · [email protected]https://fenrisk.com/hiawatha-http-smuggling · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 31 JUL 00:00Z
    An issue in Hugo Leisink Hiawatha v.12.1 and before allows a remote attacker to execute arbitrary code via a crafted request
    cvelistv5