# CVE-2026-54461: Habitica: Regex Injection / ReDoS in Member Search

> An authenticated attacker can cause denial of service in Habitica by supplying a computationally expensive regular expression in the member search query parameter.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 24 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-x772-22c9-gq58

## What is CVE-2026-54461?

CVE-2026-54461 is a medium-severity denial of service vulnerability in HabitRPG habitica, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Habitica is a habit tracker application that treats goals like a role-playing game. From 4.172.1 until 5.48.2, a query parameter on Habitica's /api/v3/groups/:groupId/members route is not sanitized before being interpreted as a regular expression. An authenticated caller can supply a computationally expensive regular expression that degrades application performance or halts Node.js processes. This issue is fixed in version 5.48.2.

Weakness: CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2026-54461?


## How do I fix CVE-2026-54461?

No fix has been published for CVE-2026-54461 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-54461 being exploited?

There is no known exploitation of CVE-2026-54461 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54461 and fix it if it is affected.

What it is: CVE-2026-54461 is a medium-severity denial of service vulnerability in HabitRPG habitica, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-54461 in the wild and no public exploit code.

Affected product: HabitRPG habitica. 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-2026-54461/ (Markdown: https://insights.sbomify.com/CVE-2026-54461/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54461
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54461
- OSV: https://osv.dev/vulnerability/CVE-2026-54461

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54461/
Summaries are generated and may contain mistakes; the official description above is the record.