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snac2

snac2 versions before 2.93 contain a heap-based buffer overflow vulnerability in the _xs_json_load_lexer() function. This flaw allows unauthenticated remote attackers to corrupt heap memory by sending specially crafted JSON strings with a \u0000 escape sequence. Exploitation involves sending a crafted application/activity+json POST request to activitypub_post_handler(), which processes the input before signature verification, leading to heap overflow and server crashes.

CVE-2026-112021 is a heap-based buffer overflow vulnerability in snac2 prior to version 2.93. The vulnerability exists in the _xs_json_load_lexer() function, which improperly handles JSON strings containing a \u0000 escape sequence. An unauthenticated remote attacker can exploit this by sending a single crafted POST request with application/activity+json content to the activitypub_post_handler() endpoint. This endpoint parses the input before performing signature checks, allowing the attacker to overflow heap allocations, corrupt heap memory, and cause the server to crash. The CVSS 4.0 score is 8.7, indicating high severity with network attack vector, no privileges or user interaction required, and high impact on availability.

snac2 versions before 2.93 contain a heap-based buffer overflow vulnerability in the _xs_json_load_lexer() function. This flaw allows unauthenticated remote attackers to corrupt heap memory by sending specially crafted JSON strings with a \u0000 escape sequence. Exploitation involves sending a craft

CVE-2026-112021: Heap-based Buffer Overflow in grunfink snac2

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