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Facil Io EUVDEUVD-2026-49360

| CVE-2026-66731 HIGH
Out-of-bounds Read (CWE-125)
2026-07-27 VulnCheck GHSA-vg6c-748h-g68q
Information Disclosure Buffer Overflow Facil Io
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 27, 2026 - 17:33 vuln.today
CVE Published
Jul 27, 2026 - 16:57 cve.org
HIGH 8.7

DescriptionCVE.org

facil.io 0.7.5 through 0.7.6 contains a denial-of-service vulnerability in the HTTP/1.1 chunked transfer encoding parser that allows unauthenticated remote attackers to crash the server by sending a negative chunk size value. Attackers can send a single POST request with a Transfer-Encoding: chunked header containing a leading minus sign in the chunk size field, causing the parser in http1_parser.h to compute a large positive integer from the negated value, corrupting internal state and moving the read pointer into unmapped memory resulting in a fault.

AnalysisAI

Denial-of-service in facil.io HTTP/1.1 chunked transfer encoding parser allows remote unauthenticated attackers to crash the server by sending a negative chunk size. Affected versions 0.7.5 through 0.7.6; a public proof-of-concept exploit exists, but no active exploitation (not in CISA KEV) is confirmed. …

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EUVD-2026-49360 vulnerability details – vuln.today
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