CVE-2026-2069

A flaw has been found in ggml-org llama.cpp up to 55abc39. Impacted is the function llama_grammar_advance_stack of the file llama.cpp/src/llama-grammar.cpp of the component GBNF Grammar Handler. This manipulation causes stack-based buffer overflow. The attack needs to be launched locally. The exploit has been published and may be used. Patch name: 18993. To fix this issue, it is recommended to deploy a patch.

CVSS v3 3.3 LOW
CVSS v2.0 1.7 LOW

3.3^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.8 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

1.7^/10

CVSS v2.0 : LOW

Vector : AV:L/AC:L/Au:S/C:N/I:N/A:P

Exploitability : 3.1 / Impact : 2.9

Access Vector LOCAL

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://github.com/ggml-org/llama.cpp/
https://github.com/ggml-org/llama.cpp/issues/18988
https://github.com/ggml-org/llama.cpp/issues/18988#event-4426704865
https://github.com/ggml-org/llama.cpp/pull/18993
https://github.com/user-attachments/files/24761101/poc.zip
https://vuldb.com/?ctiid.344636
https://vuldb.com/?id.344636
https://vuldb.com/?submit.745263

Configurations

No configuration.

History

15 Apr 2026, 00:35

Type	Values Removed	Values Added
Summary		(es) Se ha encontrado un fallo en ggml-org llama.cpp hasta 55abc39. La función afectada es llama_grammar_advance_stack del archivo llama.cpp/src/llama-grammar.cpp del componente GBNF Grammar Handler. Esta manipulación causa desbordamiento de búfer basado en pila. El ataque necesita ser lanzado localmente. El exploit ha sido publicado y puede ser usado. Nombre del parche: 18993. Para solucionar este problema, se recomienda desplegar un parche.

06 Feb 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-02-06 22:16

Updated : 2026-04-29 01:00

NVD link : CVE-2026-2069

Mitre link : CVE-2026-2069

CVE.ORG link : CVE-2026-2069

JSON object : View

Products Affected

No product.

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

CWE-121

Stack-based Buffer Overflow

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