CVE-2026-18581 ggml-org llama.cpp Jinja Minja Template parser.cpp assertion
Local attackers can trigger a reachable assertion in the Jinja Minja Template Parser, causing a denial of service in llama.cpp.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18581?
CVE-2026-18581 is a medium-severity denial of service vulnerability in ggml-org llama.cpp, published on 3 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was determined in ggml-org llama.cpp e15efe0. Affected by this issue is some unknown functionality of the file common/jinja/parser.cpp of the component Jinja Minja Template Parser. Executing a manipulation with the input {{9|9|{ can lead to reachable assertion. The attack requires local access. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-617
Which versions are affected by CVE-2026-18581?
How do I fix CVE-2026-18581?
No fix has been published for CVE-2026-18581 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-18581 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18581 exists.
Sources
Also known as DEBIAN-CVE-2026-18581, GHSA-3732-9c5p-7h79, UBUNTU-CVE-2026-18581.