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.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Http_server | Apache | 2.4.66 (including) | 2.4.66 (including) |
| Red Hat Hardened Images | RedHat | httpd-main-2.4.67-0.1.hum1 | * |
| Apache2 | Ubuntu | devel | * |
| Apache2 | Ubuntu | resolute | * |
| Apache2 | Ubuntu | upstream | * |
Potential Mitigations
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- http://www.openwall.com/lists/oss-security/2026/05/04/19
- https://access.redhat.com/errata/RHSA-2026:13938
- https://access.redhat.com/security/cve/CVE-2026-23918
- https://bugzilla.redhat.com/show_bug.cgi?id=2465304
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23918.json