# CVE-2026-14651: connorskees grass visitor denial of service

> A local attacker can cause a denial of service in the grass Sass compiler via resource exhaustion in the extend algorithm, which the maintainer considers expected behavior.

- **Severity:** Medium 4.8 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Jul 2026
- **Updated:** 6 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-14651, GHSA-x224-4j39-q7mq, UBUNTU-CVE-2026-14651

## What is CVE-2026-14651?

CVE-2026-14651 is a medium-severity denial of service vulnerability in connorskees grass, published on 4 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been found in connorskees grass up to 0.13.4. The impacted element is the function grass_compiler::selector::extend/grass_compiler::evaluate::visitor. The manipulation leads to denial of service. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. The project maintainer explains: "DoS vulnerabilities are generally fine in Sass compilers -- they are trivially possible with recursive functions, infinite loops, nested mixins, etc. The description here is wrong. Compile time is not expected to be linear relative to the input, and the @extend algorithm is definitionally exponential."

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2026-14651?


## How do I fix CVE-2026-14651?

No fix has been published for CVE-2026-14651 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-14651 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14651 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-14651 and fix it if it is affected.

What it is: CVE-2026-14651 is a medium-severity denial of service vulnerability in connorskees grass, published on 4 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14651 exists.

Affected product: connorskees grass. 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-2026-14651/ (Markdown: https://insights.sbomify.com/CVE-2026-14651/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-14651
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-14651
- OSV: https://osv.dev/vulnerability/CVE-2026-14651

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-14651/
Summaries are generated and may contain mistakes; the official description above is the record.