What’s Vulnerable › Vulnerabilities

CVE-2026-51785

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-31 · updated 2026-10-23
• Weakness: CWE-94

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://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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