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How CVE-2025-1736 Works
CVE-2025-1736 is a header injection vulnerability in PHP versions 8.1. before 8.1.32, 8.2. before 8.2.28, 8.3. before 8.3.19, and 8.4. before 8.4.5. The flaw arises due to insufficient validation of end-of-line (EOL) characters in user-supplied headers. Attackers can manipulate headers by injecting malicious EOL sequences, leading to header misinterpretation or suppression. This could facilitate HTTP response splitting, cache poisoning, or security bypasses. The vulnerability is network-exploitable but requires high attacker privilege and user interaction, contributing to its medium severity rating (CVSS:4.0 6.3).
DailyCVE Form
Platform: PHP
Version: 8.1.0-8.1.31, 8.2.0-8.2.27, 8.3.0-8.3.18, 8.4.0-8.4.4
Vulnerability: Header Injection
Severity: Medium
Date: 07/02/2025
Prediction: Patch expected by 08/15/2025
What Undercode Say
curl -I "http://vulnerable-site.com" -H "User-Agent: malicious\r\nInjected-Header: value"
header($_GET['user_header']); // Vulnerable code example
How Exploit
- Craft malicious headers with CRLF sequences
- Trigger HTTP response splitting
- Bypass security controls
Protection from this CVE
- Update PHP to 8.1.32/8.2.28/8.3.19/8.4.5
- Sanitize user-supplied headers
- Implement WAF rules
Impact
- Header manipulation
- Cache poisoning
- Security bypass
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
