Vulnerability · Published Jul 27, 2026 · Assigned by VulDB
CVE-2026-17500ggml-org llama.cpp json-schema-to-grammar.cpp _visit_pattern null pointer dereference
Medium 5.3
In plain English
A medium-severity null pointer dereference in llama.cpp from ggml-org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.7%top 45.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A vulnerability was detected in ggml-org llama.cpp d006858/e15efe0. This affects the function _visit_pattern of the file common/json-schema-to-grammar.cpp. The manipulation results in null pointer dereference. The attack can be launched remotely. The pull request to fix this issue awaits acceptance.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | llama.cpp | no fix listed | DEBIAN-CVE-2026-17500 |
| Ubuntu:26.04:LTS | llama.cpp | no fix listed | UBUNTU-CVE-2026-17500 |
| Ubuntu:26.10 | llama.cpp | no fix listed | UBUNTU-CVE-2026-17500 |
Affected products (as reported)
Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:R
References
- VDB-383353 | ggml-org llama.cpp json-schema-to-grammar.cpp _visit_pattern null pointer dereference vdb-entry, technical-description
- VDB-383353 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- CVE-2026-17500 | CVE Analysis and Report third-party-advisory
- Submit #798503 | ggml-org llama.cpp confirmed on commit d006858 / 2025-04-03 and commit e15efe0 / tag b8635+1) Reachable Assertion third-party-advisory
- https://github.com/ggml-org/llama.cpp/issues/25284 issue-tracking
- https://github.com/ggml-org/llama.cpp/pull/25308 issue-tracking, patch
- https://github.com/ggml-org/llama.cpp/ product