CVE-2026-112021 — snac2 before 2.93 Heap-Based Buffer Overflow via JSON Parser _xs_json_load_lexer()

2026-10-20T23:00:59.412010+00:00

Affected: grunfink snac2

snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server.

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CVE-2026-112021 — snac2 before 2.93 Heap-Based Buffer Overflow via JSON Parser _xs_json_load_lexer()