Stack-based Buffer Overflow in ggml-org Llama.cpp by ggml-org
CVE-2026-2069

4.8MEDIUM

Key Information:

Vendor

Ggml-org

Status
Llama.cpp
Vendor
CVE Published:
6 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2069?

A significant vulnerability has been identified in the ggml-org llama.cpp, specifically in the function llama_grammar_advance_stack found in the GBNF Grammar Handler component. This vulnerability allows an attacker to exploit a stack-based buffer overflow, necessitating local access for successful execution. The exploit is publicly known, and a patch (18993) is available to mitigate the risks associated with this flaw. Users operating versions prior to 55abc39 should prioritize applying the patch to safeguard their systems.

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Affected Version(s)

llama.cpp 55abc39

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.

CVE-2026-2069 - Proof of Concept

References

https://vuldb.com/?id.344636
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344636
signaturepermissions-required
https://vuldb.com/?submit.745263
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
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

TYGLS (VulDB User)
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