CVE-2026-44631 Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow
A heap underflow in Apache HTTP Server allows attackers to cause a denial of service via crafted regular expressions in the configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44631?
CVE-2026-44631 is a critical vulnerability in Apache Http Server, published on 8 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration.
This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
Users are recommended to upgrade to version 2.4.68, which fixes the issue.
Weakness: CWE-124
Which versions are affected by CVE-2026-44631?
1 open source package ship an affected version, including apache. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apache Bitnami | From 2.4.0 | 2.4.68 |
Products include Apache Http Server.
How do I fix CVE-2026-44631?
Upgrade apache to 2.4.68 or later.
Is CVE-2026-44631 being exploited?
There is no known exploitation of CVE-2026-44631 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
Sources
Also known as ALPINE-CVE-2026-44631, AZL-89735, BELL-CVE-2026-44631, BIT-apache-2026-44631, CLSA-2026-1782212784, CLSA-2026-1782293864 and 6 more.