CVE-2026-45090: hahwul Dalfox denial of service in ParameterAnalysis

CVE-2026-45090 · Severity: high · CVSS 7.5 · Published 2026-05-27

Dalfox, a tool used for scanning web applications for vulnerabilities, is susceptible to a remote crash when running in its server (REST API) mode. An unauthenticated attacker can send a specially crafted scan request that causes the Dalfox process to terminate immediately due to an internal programming error. This results in a total loss of availability for the scanning service and requires a manual restart to restore operations.

Technologies: github.com/hahwul/dalfox (Go), github.com/hahwul/dalfox/v2 (Go), Hahwul Dalfox. Vendors: Go, Hahwul.

Quick answers

Is CVE-2026-45090 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-45090 being exploited in the wild.
How severe is CVE-2026-45090?
High severity, with a CVSS score of 7.5, published 27 May 2026.
Which products and versions are affected?
github.com/hahwul/dalfox (Go) <= 1.2.2, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=1.2.2; github.com/hahwul/dalfox/v2 (Go) <= 2.12.0, SEMVER:introduced=0,fixed=2.13.0; Hahwul Dalfox <= 1.2.2, <= 2.12.0.
Is there a fix for CVE-2026-45090?
Yes. github.com/hahwul/dalfox/v2 (Go): upgrade to 2.13.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-45090 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-45090?
Check whether you run github.com/hahwul/dalfox (Go), github.com/hahwul/dalfox/v2 (Go) or Hahwul Dalfox at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/hahwul/dalfox/v2 (Go): upgrade to 2.13.0 or later
    go get github.com/hahwul/dalfox/v2@v2.13.0

Technical details

A structural ordering bug in 'pkg/scanning/parameterAnalysis.go' causes a Go runtime panic when the application is running in server mode. The 'ParameterAnalysis' function utilizes a two-stage worker process sharing a single 'results' channel. The channel is closed after the first stage (URL parameter processing) completes, but is subsequently reused by the second stage (POST-body parameter processing). If a parameter is reflected during the second stage, the 'processParams' function attempts to send data to the already-closed channel, triggering a panic that crashes the entire process. This is exploitable remotely without authentication because the REST API defaults to no API key and the attacker can control the 'data' field and target URL to trigger the reflection condition.

Affected products

  • hahwul dalfox <= 1.2.2
  • hahwul dalfox/v2 <= 2.12.0

Identifiers

  • CVE-2026-45090
  • GHSA-2g4x-fq3j-cgq4
  • GO-2026-4999

Timeline

  • 2026-05-07: disclosed: Initial disclosure of the vulnerability.
  • 2026-05-12: advisory: GHSA-2g4x-fq3j-cgq4 published.

References

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