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PHP Issues Second Windows Security Update in Five Days to Fix Brotli Code Execution Flaw

The Hacker News
WindowsCVEMicrosoftVulnerabilityUpdate

Overview

PHP has released updated Windows packages for versions 8.2 through 8.5 to address a significant security flaw in the Brotli compression library, identified as CVE-2026-111497. This vulnerability could allow attackers to corrupt memory and potentially execute arbitrary code. The flaw is particularly concerning as it can be exploited through the cURL extension when it decompresses HTTP responses, although this feature is not enabled by default. Users and developers who rely on these PHP versions should take immediate action to update their systems to prevent possible exploitation. This situation underscores the importance of timely software updates in maintaining security.

Key Takeaways

  • Affected Systems: Affected products include PHP versions 8.2, 8.3, 8.4, and 8.5 on Windows. The vulnerability is tied to the Brotli compression library integrated within these PHP packages.
  • Action Required: PHP has rebuilt its official Windows packages for versions 8.
  • Timeline: Newly disclosed

Original Article Summary

PHP has rebuilt its official Windows packages for PHP 8.2 through 8.5 to fix CVE-2026-111497, a flaw in the Brotli compression library that the packages include. The flaw can let an attacker corrupt memory and potentially run code. PHP says the flaw can be reached through the cURL extension when the extension decompresses HTTP responses automatically. cURL leaves that off by default, but

Impact

Affected products include PHP versions 8.2, 8.3, 8.4, and 8.5 on Windows. The vulnerability is tied to the Brotli compression library integrated within these PHP packages.

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Newly disclosed

Remediation

PHP has rebuilt its official Windows packages for versions 8.2 through 8.5 to address this flaw. Users should update to the latest versions of PHP to mitigate the risk associated with this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Windows, CVE, Microsoft, and 2 more.

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