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CVE-2026-112021

8.7 high SSVC exploitation: poc Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusReceived → DeferredNVD modified 2026-10-19 21:14
  2. First seenCVSS 8.7NVD modified 2026-10-19 16:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 7