# CVE-2026-11478: kokke tiny-regex-c Pattern re.c matchstar redos

> A local attacker can cause denial of service in the tiny-regex-c library via inefficient regular expression complexity in the matchstar function.

- **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:** 8 Jun 2026
- **Updated:** 8 Jun 2026
- **Also known as:** GHSA-8hjh-2xhj-mx62

## What is CVE-2026-11478?

CVE-2026-11478 is a medium-severity denial of service vulnerability in kokke tiny-regex-c, published on 8 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw has been found in kokke tiny-regex-c up to f2632c6d9ed25272987471cdb8b70395c2460bdb. This vulnerability affects the function matchstar of the file re.c of the component Pattern Handler. This manipulation causes inefficient regular expression complexity. The attack is restricted to local execution. The exploit has been published and may be used. This product adopts a rolling release strategy to maintain continuous delivery. Therefore, version details for affected or updated releases cannot be specified. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-400 (Uncontrolled Resource Consumption), CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2026-11478?


## How do I fix CVE-2026-11478?

No fix has been published for CVE-2026-11478 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11478 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-11478 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11478 and fix it if it is affected.

What it is: CVE-2026-11478 is a medium-severity denial of service vulnerability in kokke tiny-regex-c, published on 8 Jun 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-2026-11478 exists.

Affected product: kokke tiny-regex-c. 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-2026-11478/ (Markdown: https://insights.sbomify.com/CVE-2026-11478/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11478
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11478
- OSV: https://osv.dev/vulnerability/CVE-2026-11478

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11478/
Summaries are generated and may contain mistakes; the official description above is the record.