snac2: snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenti...
CVE-2026-112021 is fixed in snac2 on 1 platform by DEBIAN-CVE-2026-112021 (version 2.93-1), released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| snac2 · Debian 14 | 2.93-1 | DEBIAN-CVE-2026-112021 | Oct 19, 2026 |
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