CVE-2026-51785

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

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

1.1% chance of exploitation in the next 30 days; higher than 66% of CVEs (scores of 2026-10-25)

CWE

CWE-94

Published

2026-07-31

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

References

• https://fenrisk.com/hiawatha-http-smuggling
• https://www.rfc-editor.org/rfc/rfc2616
• https://www.rfc-editor.org/rfc/rfc2616.html#section-4.4
• https://www.rfc-editor.org/rfc/rfc9112.html#section-6.3
• https://fenrisk.com/hiawatha-http-smuggling

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