8.8 CVE-2026-23918
Enriched by CISA Exploit
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.
https://nvd.nist.gov/vuln/detail/CVE-2026-23918
Categories
CWE-415 : Double Free
The product calls free() twice on the same memory address. Fuzz testing (fuzzing) is a powerful technique for generating large numbers of diverse inputs - either randomly or algorithmically - and dynamically invoking the code with those inputs. Even with random inputs, it is often capable of generating unexpected results such as crashes, memory corruption, or resource consumption. Fuzzing effectively produces repeatable test cases that clearly indicate bugs, which helps developers to diagnose the issues. Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) Use tools that are integrated duringcompilation to insert runtime error-checking mechanismsrelated to memory safety errors, such as AddressSanitizer(ASan) for C/C++ [REF-1518]. Choose a language that provides automatic memory management. Ensure that each allocation is freed only once. After freeing a chunk, set the pointer to NULL to ensure the pointer cannot be freed again. In complicated error conditions, be sure that clean-up routines respect the state of allocation properly. If the language is object oriented, ensure that object destructors delete each chunk of memory only once. Use a static analysis tool to find double free instances. Chain: Signal handler contains too much functionality (CWE-828), introducing a race condition (CWE-362) that leads to a double free (CWE-415). Double free resultant from certain error conditions. Double free resultant from certain error conditions. Double free resultant from certain error conditions. Double free from invalid ASN.1 encoding. Double free from malformed GIF. Double free from malformed GIF. Double free from malformed compressed data.
References
af854a3a-2127-422b-91ae-364da2661108
| http://www.openwall.com/lists/oss-security/2026/05/04/19 Mailing List Third Party Advisory |
security@apache.org
| https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory |
AFFECTED (from MITRE)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
|
| © 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. | ||
CPE
| cpe | start | end |
|---|---|---|
| Configuration 1 | ||
| cpe:2.3:a:apache:http_server:2.4.66:*:*:*:*:*:*:* | ||
REMEDIATION
EXPLOITS
Exploit-db.com
| id | description | date | |
|---|---|---|---|
| No known exploits | |||
POC Github
Other Nist (github, ...)
| Url |
|---|
| No known exploits |
CAPEC
Common Attack Pattern Enumerations and Classifications
| id | description | severity |
|---|---|---|
| No entry | ||
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