# CVE-2026-52130: Denial of service in n/a

> An attacker can cause a denial of service in llama.cpp via uncontrolled recursion in JSON schema processing.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Sep 2026
- **Updated:** 1 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-52130, GHSA-8q78-m7w9-j45m, UBUNTU-CVE-2026-52130

## What is CVE-2026-52130?

CVE-2026-52130 is a high-severity denial of service vulnerability in n/a, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

llama.cpp b5693 and before is vulnerable to Uncontrolled Recursion in common/json-schema-to-grammar.cpp, resulting in a denial of service.

Weakness: CWE-674 (Uncontrolled Recursion)

## Which versions are affected by CVE-2026-52130?

It affects 1 product.


Products: Ggml Llama.cpp.

## How do I fix CVE-2026-52130?

No fix has been published for CVE-2026-52130 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-52130 being exploited?

There is no known exploitation of CVE-2026-52130 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-42479](https://insights.sbomify.com/CVE-2024-42479/): llama.cpp allows write-what-where in rpc_server::set_tensor (critical 10.0)
- [CVE-2026-34159](https://insights.sbomify.com/CVE-2026-34159/): llama.cpp: Unauthenticated RCE via GRAPH_COMPUTE buffer=0 bypass in llama.cpp RPC backend (critical 9.8)
- [CVE-2026-43629](https://insights.sbomify.com/CVE-2026-43629/): llama.cpp b4882–b9058 Buffer Overflow in KV Cache State Restore (critical 9.2)
- [CVE-2026-43631](https://insights.sbomify.com/CVE-2026-43631/): llama.cpp b7492–b9060 Use-After-Free RCE via llama-server (critical 9.2)
- [CVE-2026-43632](https://insights.sbomify.com/CVE-2026-43632/): llama.cpp b7492–b9060 Use-After-Free in Tokenization Endpoints (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-52130 and fix it if it is affected.

What it is: CVE-2026-52130 is a high-severity denial of service vulnerability in n/a, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-52130 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-52130/ (Markdown: https://insights.sbomify.com/CVE-2026-52130/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-52130
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-52130
- OSV: https://osv.dev/vulnerability/CVE-2026-52130

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-52130/
Summaries are generated and may contain mistakes; the official description above is the record.