Contribsys Faktory up to 1.9.x Command input validation

Summaryinfo

A vulnerability classified as problematic was found in Contribsys Faktory up to 1.9.x. The impacted element is an unknown function of the component Command Handler. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-63403. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Contribsys Faktory up to 1.9.x and classified as problematic. Affected by this issue is an unknown function of the component Command Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. CVE summarizes:

Faktory is a language-agnostic background job server. In versions prior to 1.10.0, the server is vulnerable to an unauthenticated denial of service in which a single malformed command crashes the entire process. Its wire protocol is line-based, and several command handlers slice or index the received line at a fixed offset, such as cmd[5:] for PUSH or qs[0] for QUEUE, without checking that a payload is present. Sending a bare verb with no payload, for example PUSH, ACK, FAIL, BEAT, PUSHB, or QUEUE, triggers a Go slice or index out-of-range panic. Because the codebase has no recover() anywhere in the command-dispatch path, an unrecovered panic in a handler goroutine terminates the whole Go process rather than just that connection, instantly disconnecting every other client, worker, and in-flight job. The attack requires only a connection to the command port and completion of the trivial handshake, with no credentials when no password is configured, and can be repeated to keep the service down indefinitely. This issue is fixed in version 1.10.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-63403 since 07/16/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

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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