Out-of-bounds Read Affecting cesanta/mongoose package, versions [,7.22)
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-CESANTAMONGOOSE-17912426
- published9 Jul 2026
- disclosed9 Jul 2026
- creditUnknown
Introduced: 9 Jul 2026
CVE-2026-11404 (opens in a new tab)How to fix?
Upgrade cesanta/mongoose to version 7.22 or higher.
Overview
cesanta/mongoose is a networking library for C/C++. It implements event-driven non-blocking APIs for TCP, UDP, HTTP, WebSocket, MQTT.
Affected versions of this package are vulnerable to Out-of-bounds Read via the mg_tls_server_recv_hello function. An attacker can cause a crash of any HTTPS, MQTTS, or WSS service built on MG_TLS_BUILTIN by sending a crafted ClientHello message with an oversized session id length, leading to reading past the receive buffer.