hahwul dalfox up to 2.12.x REST API parameterAnalysis.go race condition

Summaryinfo

A vulnerability was found in hahwul dalfox up to 2.12.x. It has been rated as problematic. This impacts an unknown function of the file pkg/scanning/parameterAnalysis.go of the component REST API. The manipulation leads to race condition. This vulnerability is referenced as CVE-2026-45090. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in hahwul dalfox up to 2.12.x and classified as problematic. This issue affects an unknown function of the file pkg/scanning/parameterAnalysis.go of the component REST API. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is availability. The summary by CVE is:

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, ParameterAnalysis in pkg/scanning/parameterAnalysis.go runs two sequential worker stages that both write to the same results channel. The channel is correctly closed after the first stage completes (close(results) at line 438), but the second stage — which processes POST-body parameters (dp) — is then launched with the same already-closed channel as its output. When a scanned parameter is reflected, processParams executes results <- paramResult on the closed channel, triggering a Go runtime panic that crashes the entire dalfox process. In server mode, the crash is remotely triggerable by any unauthenticated caller who can reach the REST API, because the default configuration has no API key and the second stage activates whenever options.Data != "" (i.e., the attacker supplies the data field) and the target reflects at least one parameter. This vulnerability is fixed in 2.13.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-45090 since 05/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 2.13.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• hahwul

Name

• dalfox

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12

Website

• Product: https://github.com/hahwul/dalfox/

CPE 2.3info

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CPE 2.2info

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