# CVE-2026-63404: Faktory: Insecure predictable /tmp/redis.conf enables local Redis config hijack (network exposure / root RCE primitive)

> Local attackers can hijack predictable Redis config files to expose job queues or execute arbitrary code as root via loadmodule directives.

- **Severity:** High 7.3 (`CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **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:** 25 Aug 2026
- **Updated:** 28 Aug 2026
- **Also known as:** GHSA-j2vx-rpwf-w77v

## What is CVE-2026-63404?

CVE-2026-63404 is a high-severity vulnerability in contribsys faktory, published on 25 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Faktory is a language-agnostic background job server. In versions prior to 1.10.0, the embedded Redis bootstrapper is vulnerable to an insecure temporary file flaw that lets a local unprivileged user hijack the Redis configuration and escalate to root. It writes its startup configuration to a fixed, predictable, world-writable path, /tmp/redis.conf, only creating the file if it does not already exist and never validating it on later boots. Because /tmp is world-writable, a local unprivileged user can pre-create /tmp/redis.conf with attacker-chosen Redis directives before Faktory starts, and Faktory will use the planted file verbatim. Faktory only overrides the unixsocket, dir, and logfile options, leaving directives such as bind, protected-mode, requirepass, and loadmodule attacker-controlled. This lets an attacker silently expose the entire job queue over an unauthenticated network port with no visible error to the administrator. Because the official systemd unit runs Faktory, and the redis-server child it spawns, as root, an attacker can also supply a loadmodule directive to execute arbitrary native code in the root-owned Redis process, escalating from a local unprivileged user to root. This issue is fixed in version 1.10.0.

Weakness: CWE-377 (DEPRECATED: Insecure Temporary File)

## Which versions are affected by CVE-2026-63404?


## How do I fix CVE-2026-63404?

No fix has been published for CVE-2026-63404 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-63404 being exploited?

There is no known exploitation of CVE-2026-63404 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-63404 and fix it if it is affected.

What it is: CVE-2026-63404 is a high-severity vulnerability in contribsys faktory, published on 25 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-63404 in the wild and no public exploit code.

Affected product: contribsys faktory. 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-2026-63404/ (Markdown: https://insights.sbomify.com/CVE-2026-63404/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-63404
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63404
- OSV: https://osv.dev/vulnerability/CVE-2026-63404

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-63404/
Summaries are generated and may contain mistakes; the official description above is the record.