CVE-2026-112021

HighCVSS 7.5/10Last modified Oct 19, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-122

Affected software

No affected versions have been published.

Timeline

Published: Oct 18, 2026
Last modified: Oct 19, 2026
NVD status: Deferred

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