CVE-2026-112021 — 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 JSO…
Published: 2026-10-18 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7