Quick answers
- Is CVE-2026-109163 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109163 being exploited in the wild.
- How severe is CVE-2026-109163?
- Informational severity, published 11 November 2026.
- Which products and versions are affected?
- Apache HTTP Server 2.4.69, 2.4.70.
- Is there a fix for CVE-2026-109163?
- Yes: fixed in Apache HTTP Server 2.4.71. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-109163 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-109163?
- Check whether you run Apache HTTP Server 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
- Fixed in: Apache HTTP Server 2.4.71
Technical details
A stack-based buffer overflow in mod_vhost_alias allows writing one byte beyond a stack buffer. The vulnerability is triggered when processing HTTP requests with specially crafted Host headers on a system where VirtualDocumentRoot uses a hostname format specifier. No authentication or user interaction is required; the attack is network-accessible.
Affected products
- Apache HTTP Server 2.4.69, 2.4.70
Timeline
- 2026-11-11: disclosed
- 2026-11-11: patched: Apache HTTP Server 2.4.71 released