Grunfink Snac2 vulnerabilities

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Published CVEs affecting Grunfink Snac2: 1 record(s), with affected versions and fixes.

CVE-2026-112021 High · 7.5 CWE-122 Oct 18, 2026

snac2 before 2.93 Heap-Based Buffer Overflow via JSON Parser _xs_json_load_lexer()

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.