Integer Overflow or Wraparound Affecting cesanta/mongoose package, versions [,7.18)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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Start learning- Snyk IDSNYK-UNMANAGED-CESANTAMONGOOSE-13147794
- published30 Sept 2025
- disclosed29 Sept 2025
- creditcainiao159357
Introduced: 29 Sep 2025
CVE-2025-51495 (opens in a new tab)How to fix?
Upgrade cesanta/mongoose to version 7.18 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 Integer Overflow or Wraparound in the mg_ws_cb function. An attacker can cause the application to crash by sending a specially crafted WebSocket request containing ofs=0.