HTTP Response Splitting Affecting apache/httpd package, versions [2.4.0,2.4.67)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-APACHEHTTPD-16417738
- published5 May 2026
- disclosed4 May 2026
- creditHaruki Oyama, Merih Mengisteab, Dawit Jeong
Introduced: 4 May 2026
CVE-2026-33523 (opens in a new tab)How to fix?
Upgrade apache/httpd to version 2.4.67 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Response Splitting via forwarding a malicious status line from an untrusted or compromised backend server. An attacker can inject arbitrary HTTP headers or manipulate the HTTP response by sending specially crafted responses from the backend, potentially leading to cache poisoning or cross-site scripting attacks.