Out-of-bounds Write Affecting civetweb package, versions [0,]
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-CONAN-CIVETWEB-20078928
- published24 Sept 2026
- disclosed11 Aug 2026
- creditUnknown
Introduced: 11 Aug 2026
CVE-2026-29035 (opens in a new tab)How to fix?
There is no fixed version for civetweb.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the read_websocket function when processing compressed WebSocket frames with permessage-deflate negotiation. An attacker can corrupt memory, potentially leading to denial of service or code execution, by sending crafted WebSocket frames with the RSV1 bit set. This is only exploitable if both USE_ZLIB and MG_EXPERIMENTAL_INTERFACES are defined.