CVE-2006-3918: Apache HTTP Server

Medium severity, CVSS 4.3. EPSS: 95.1% chance of exploitation in the next 30 days.

http_protocol.c in (1) IBM HTTP Server 6.0 before 6.0.2.13 and 6.1 before 6.1.0.1, and (2) Apache HTTP Server 1.3 before 1.3.35, 2.0 before 2.0.58, and 2.2 before 2.2.2, does not sanitize the Expect header from an HTTP request when it is reflected back in an error message, which might allow cross-site scripting (XSS) style attacks using web client components that can send arbitrary headers in requests, as demonstrated using a Flash SWF file.

Affected products

• Apache HTTP Server: from 1.3.3, before 1.3.35 (fixed in 1.3.35)
• Canonical Ubuntu Linux: version 6.06 only; version 6.10 only; version 7.04 only; version 7.10 only
• Debian Debian Linux: version 3.1 only
• Red Hat Enterprise Linux Server: version 2.0 only
• Red Hat Enterprise Linux Workstation: version 2.0 only

Published 2006-07-28. Last modified 2026-06-16.