CVE-2026-2069

1.9 LOW 0.1% exploit odds Fix listed Memory safety

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. Limited direct impact.
Exploit odds: 0.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-02-06 22:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 10:30 UTC Last updatedMost recent change to the record

Details

Published: 2026-02-06 22:16 UTC
Last modified: 2026-06-17 10:30 UTC
Exploit probability: 0.1% · EPSS, next 30 days
Weakness: CWE-119 · Buffer errors
Record status: Deferred

Attack profile CVSS 4.0 · 1.9

Attack vector: Local
Complexity: Low
Attack requirements: None
Privileges needed: Low
User interaction: None
Confidentiality: None
Integrity: None
Availability: Low

Raw vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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Fix and advisories

https://github.com/ggml-org/llama.cpp/pull/18993

References

NVD record · CVE.org record