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libwebsockets contains an out-of-bounds read vulnerability in the LEJP incremental parser in lib/misc/lejp.c. This allows a remote attacker to cause a denial of service
Buffer Overflow vulnerability in libwebsockets main 106d542c allows a remote attacker to cause a denial of service via the LEJP JSON parser
Last updated 7 October 2026
This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of HTTP/2 HPACK path header. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.
This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of HTTP/2 HPACK path header. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.