CVE-2026-106023: 
Apache HTTP Server Analyse et atténuation de la vulnérabilité

CVE-2026-106023 is a NULL pointer dereference vulnerability in the mod_md module of Apache HTTP Server, triggered during HTTP request processing. It affects Apache HTTP Server versions 2.4.30 through 2.4.69 and was disclosed on November 11, 2026. The vulnerability is classified as CWE-476 (NULL Pointer Dereference) and carries an estimated CVSS severity of Medium (Apache Advisory, GitHub Advisory).

The root cause is a NULL pointer dereference (CWE-476) in Apache HTTP Server's mod_md module — the module responsible for managing TLS certificates via the ACME protocol (e.g., Let's Encrypt). An unauthenticated attacker can send specially crafted HTTP requests that cause the module to dereference a NULL pointer, crashing the child process handling the request. No authentication or special privileges are required to trigger the flaw, making it remotely exploitable by any network-accessible attacker (Apache Advisory, GitHub Advisory).

Successful exploitation causes the Apache HTTP Server child process to crash, resulting in a temporary denial of service. Because Apache uses a multi-process/multi-thread model, the main server process typically restarts the crashed child, limiting the impact to transient service disruption rather than a full server outage. There is no evidence of confidentiality or integrity impact; the vulnerability is limited to availability (Apache Advisory).

There is no public proof-of-concept exploit and no evidence of active in-the-wild exploitation as of the disclosure date (Apache Advisory). The EPSS score is reported as 0.0, indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified.

Upgrade Apache HTTP Server to a version beyond 2.4.69 that includes the fix released on November 11, 2026, as referenced in the Apache security advisory. As an interim workaround, administrators who do not require ACME-based certificate management can disable the mod_md module entirely (a2dismod md on Debian/Ubuntu-based systems, or removing the LoadModule md_module directive). Additionally, network-level access controls can be implemented to restrict untrusted HTTP requests to the server (Apache Advisory, Apache Vulnerabilities).

The vulnerability received routine coverage from security news aggregators and community feeds, including posts on Bluesky/Infosec.exchange and coverage by SecurityOnline.info in the context of the broader Apache HTTP Server 2.4.71 release addressing multiple CVEs. Community sentiment reflects low urgency given the Medium severity rating, absence of a public PoC, and the limited denial-of-service impact (Apache Advisory).