# CVE-2026-59966: Tandoor Recipes: ReDoS (Regular Expression Denial of Service) via User-Controlled Automation Regex Patterns

> An attacker can cause denial of service in Tandoor Recipes by submitting malicious regex patterns that exhaust server resources during recipe imports.

- **Severity:** Medium 5.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-f2gw-c2c7-59v7

## What is CVE-2026-59966?

CVE-2026-59966 is a medium-severity denial of service vulnerability in TandoorRecipes recipes, published on 16 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Tandoor Recipes is an application for managing recipes, planning meals, and building shopping lists. Prior to 2.6.10, executes user-controlled Automation regular-expression patterns with Python re.sub() without complexity validation or an execution timeout when an authenticated user stores a catastrophic-backtracking regex and any user in the same Space imports a matching recipe. Request processing uses Automation.param_2, apply_regex_replace_automation, sub, api/recipe-from-source/. The attack works because the shared-Space automation engine evaluates the malicious pattern during recipe import and can occupy a Gunicorn worker until its request timeout. This can exhaust application worker slots and make the service unavailable to users. This issue is fixed in version 2.6.10.

Weakness: CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2026-59966?


## How do I fix CVE-2026-59966?

No fix has been published for CVE-2026-59966 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-59966 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59966 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-59966 and fix it if it is affected.

What it is: CVE-2026-59966 is a medium-severity denial of service vulnerability in TandoorRecipes recipes, published on 16 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59966 exists.

Affected product: TandoorRecipes recipes. 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-2026-59966/ (Markdown: https://insights.sbomify.com/CVE-2026-59966/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-59966
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59966
- OSV: https://osv.dev/vulnerability/CVE-2026-59966

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-59966/
Summaries are generated and may contain mistakes; the official description above is the record.