Contribsys Faktory up to 1.9.x Embedded Redis Bootstrapper /tmp/redis.conf temp file

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Contribsys Faktory up to 1.9.x. This affects an unknown function of the file /tmp/redis.conf of the component Embedded Redis Bootstrapper. Performing a manipulation results in temp file. This vulnerability was named CVE-2026-63404. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Contribsys Faktory up to 1.9.x. It has been classified as very critical. This affects an unknown functionality of the file /tmp/redis.conf of the component Embedded Redis Bootstrapper. The manipulation with an unknown input leads to a temp file vulnerability. CWE is classifying the issue as CWE-377. Creating and using insecure temporary files can leave application and system data vulnerable to attack. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-63404 since 07/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/26/2026).

Upgrading to version 1.10.0 eliminates this vulnerability.

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Productinfo

Vendor

• Contribsys

Name

• Faktory

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9

Website

• Product: https://github.com/contribsys/faktory/

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