Heap-Based Buffer Overflow in Snac2 by Grunfink
CVE-2026-112021
8.7HIGH
Key Information:
Badges
👾 Exploit Exists🟡 Public PoC
What is CVE-2026-112021?
The Snac2 application prior to version 2.93 contains a vulnerability in the JSON loader function _xs_json_load_lexer(), which can be exploited by unauthenticated remote attackers. By crafting a specific POST request with a JSON string containing a null escape sequence, an attacker can overflow heap memory allocations. This overflow can result in corrupted memory, leading to server crashes and system instability.
Affected Version(s)
snac2 0 < 2.93
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.
References
CVSS V4
Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None
Timeline
- 🟡
Public PoC available
- 👾
Exploit known to exist
Vulnerability published
Vulnerability Reserved
Credit
nullenvk