PT-2026-6804 · Ggml Org · Llama.Cpp

Tygls · Published 2026-02-06 · Updated 2026-02-06 · CVE-2026-2069

Positive Technologies (AI Summary)

CVSS v3.1

3.3

Low

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions ggml-org llama.cpp versions prior to 55abc39

Description A flaw exists in the GBNF Grammar Handler component of ggml-org llama.cpp. Specifically, the llama grammar advance stack function within the llama.cpp/src/llama-grammar.cpp file is susceptible to a stack-based buffer overflow. This manipulation requires local access to launch the attack. An exploit for this issue has been published.

Recommendations Apply patch 18993.

Exploit

Fix

Stack Overflow

Buffer Overflow

Weakness Enumeration

CWE-121

CWE-119

Related Identifiers

CVE-2026-2069

Affected Products

Llama.Cpp

References · 16

• 🔥❌ https://github.com/user-attachments/files/24761101/poc.zip · Exploit, Deleted
• https://github.com/ggml-org/llama.cpp/pull/18993 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-2069 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2069 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2069 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-2069 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-2069 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2069 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-2069 · Vendor Advisory
• https://github.com/ggml-org/llama.cpp/issues/18988 · Note
• https://github.com/ggml-org/llama.cpp/issues/18988#event-4426704865 · Note
• https://twitter.com/CVEnew/status/2019906711574774148 · Twitter Post
• https://vuldb.com/?ctiid.344636 · Note
• https://github.com/ggml-org/llama.cpp · Note
• https://vuldb.com/?id.344636 · Note