CVE-2026-2069

LOW

ggml-org llama.cpp <55abc39 - Buffer Overflow

Title source: llm
STIX 2.1

Description

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.

References (8)

Core 8
Core References
Permissions Required, VDB Entry vdb-entry technical-description
https://vuldb.com/?id.344636
Permissions Required, VDB Entry signature permissions-required
https://vuldb.com/?ctiid.344636
Permissions Required, VDB Entry third-party-advisory
https://vuldb.com/?submit.745263
Issue Tracking issue-tracking patch
https://github.com/ggml-org/llama.cpp/pull/18993
Various Sources product
https://github.com/ggml-org/llama.cpp/

Scores

CVSS v3 3.3
EPSS 0.0002
EPSS Percentile 5.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-119 CWE-121
Status published
Products (1)
ggml-org/llama.cpp 55abc39
Published Feb 06, 2026
Tracked Since Feb 18, 2026