HIGH 8.3 NVD
CVE-2026-29035
CivetWeb (commit 4a4f0c95) contains a heap and stack buffer overflow vulnerability in the read_websocket() function that allows unauthenticated remote attackers
CivetWeb (commit 4a4f0c95) contains a heap and stack buffer overflow vulnerability in the read_websocket() function that allows unauthenticated remote attackers to corrupt memory by sending compressed WebSocket frames when both USE_ZLIB and MG_EXPERIMENTAL_INTERFACES are defined. Attackers can negotiate permessage-deflate during the WebSocket handshake and send a crafted frame with the RSV1 bit set, causing the server to write a 4-byte zlib sync trailer out-of-bounds past the allocated buffer, leading to heap metadata corruption, denial of service, or potential code execution.
References
- https://github.com/civetweb/civetweb
- https://www.vulncheck.com/advisories/civetweb-heap-stack-buffer-overflow-via-websocket-per
This high severity vulnerability with a CVSS score of 8.3 was published on 2026-08-11 via NVD.
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