CVE-2026-23918 Apache HTTP Server: http2: double free and possible RCE on early reset
Attackers can trigger a double free in the HTTP/2 module, potentially leading to remote code execution or denial of service on Apache HTTP Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23918?
CVE-2026-23918 is a high-severity use after free vulnerability in Apache Http Server, published on 4 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.
This issue affects Apache HTTP Server: 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
Which versions are affected by CVE-2026-23918?
1 open source package ship an affected version, including apache. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apache Bitnami | From 2.4.66 | 2.4.67 |
Products include Apache Http Server.
How do I fix CVE-2026-23918?
Upgrade apache to 2.4.67 or later.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-23918 being exploited?
There is no known exploitation of CVE-2026-23918 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry and 15 proofs of concept on GitHub.
Other vulnerabilities in Apache Http Server
Sources
Also known as ALPINE-CVE-2026-23918, AZL-86004, BELL-CVE-2026-23918, BIT-apache-2026-23918, CLSA-2026-1778054005, CLSA-2026-1778070287 and 5 more.