Out-of-bounds Read Affecting boazsegev/facil.io package, versions [0.7.5,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-BOAZSEGEVFACILIO-18507956
- published2 Aug 2026
- disclosed27 Jul 2026
- creditUnknown
Introduced: 27 Jul 2026
NewCVE-2026-66731 (opens in a new tab)How to fix?
There is no fixed version for boazsegev/facil.io.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read via the http1_parser.h process. An attacker can cause the server to crash by sending a POST request with a Transfer-Encoding: chunked header containing a negative chunk size value, which leads the parser to compute an incorrect large positive integer, corrupting internal state and moving the read pointer into unmapped memory, resulting in a fault.