Apache HTTP 2.4.68 Buffer Overflow via Host Header > 8192 in mod_vhost_alias
CVE-2026-63292 Published on October 1, 2026

Apache HTTP Server: mod_vhost_alias stack overflow
Stack-based buffer overflow in mod_vhost_alias in Apache Software Foundation Apache HTTP Server through 2.4.68 on all platforms allows a remote client to cause a denial of service or potentially execute arbitrary code via an HTTP request with a Host header exceeding 8192 bytes when VirtualDocumentRoot uses a hostname format specifier and LimitRequestFieldSize is raised above the default. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-63292 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Timeline

Report received

fixed in 2.4.x by r1938676 106 days later.

2.4.69 released

Weakness Type

What is a Stack Overflow Vulnerability?

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

CVE-2026-63292 has been classified to as a Stack Overflow vulnerability or weakness.


Products Associated with CVE-2026-63292

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Apache HTTP Server
 

Affected Versions

Apache Software Foundation Apache HTTP Server: