Quick answers
- Is CVE-2026-107409 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-107409 being exploited in the wild.
- How severe is CVE-2026-107409?
- Informational severity, published 13 November 2026.
- Which products and versions are affected?
- Citrix NetScaler ADC; Citrix NetScaler Gateway.
- Is there a fix for CVE-2026-107409?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-107409 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-107409?
- Check whether you run Citrix NetScaler ADC or Citrix NetScaler Gateway. 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.
Technical details
A memory corruption flaw exists in the DNS-over-HTTPS (DoH) processing component of NetScaler ADC and NetScaler Gateway. The vulnerability can be triggered through network-based DoH requests, leading to denial of service or unpredictable appliance behavior. Exploitation does not appear to require authentication or user interaction.
Affected products
- Citrix NetScaler ADC
- Citrix NetScaler Gateway
Timeline
- 2026-11-13: disclosed