CVE WatchJul 27, 2026

CVE-2026-66731

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 unauthe

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Jul 27, 2026 · Last modified: Jul 27, 2026 · CWE-125

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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