: Improper memory operations in the xmlrpc_decode function and xmlrpc base64 code could lead to out-of-bounds reads, resulting in potential system compromise or sensitive information disclosure.
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PHP 5.6.40 (cli) (built: Jan 10 2019 12:00:00)
This highly publicized vulnerability involves Nginx configurations using fastcgi_split_path_info . An attacker can manipulate the path info using newline characters ( %0a ), causing a buffer underflow in PHP-FPM. This allows the attacker to overwrite configuration parameters (like modules_set ) and force the server to execute arbitrary code via the PATH_INFO variable. 2. Fileinfo Read Out-of-Bounds (CVE-2019-11035) Type: Out-of-bounds Read Component: ext/fileinfo (libmagic) Impact: Information Disclosure / Denial of Service (DoS) php version 5640 vulnerabilities verified
The release of PHP 5.6.40 on January 10, 2019, marked the official end of life (EOL) for the PHP 5.x release cycle. Designed as a final security release, this version addressed several critical flaws. However, because this version is no longer maintained by the PHP Development Team, any vulnerability discovered after January 2019 remains unpatched in the upstream source code.
all user-supplied data before it reaches the database or sensitive functions. If you're planning a migration, I can help you with a compatibility checklist common syntax changes
Below are the most severe, verified CVEs (Common Vulnerabilities and Exposures) affecting PHP 5.6.40. These are not theoretical; they have active exploit paths. : Improper memory operations in the xmlrpc_decode function
Vulnerabilities in the image processing library allow attackers to upload malformed WebP, JPEG, or GIF files. This triggers integer overflows, causing the server to crash (Denial of Service) or execute code via corrupted heap memory.
Deploy a WAF (such as Cloudflare, AWS WAF, or ModSecurity) in front of your server. Configure rules specifically designed to block:
As of March 2026, only four PHP versions are actively supported: 8.2, 8.3, 8.4, and 8.5. Everything from PHP 8.1 and below is end- FreePBX 15.0.17.67 PHP Version 5.6.40 vulnerability An attacker can manipulate the path info using
| CVE ID | Vulnerability Type | Description | Risk Level | Base Score | | :--- | :--- | :--- | :--- |:--- | | | Buffer Underflow / Remote Code Execution (RCE) | A buffer underflow in php-fpm leading to RCE in specific Nginx+php-fpm configurations, one of the most severe for this version. | Critical | 9.8 (CVSS 3.1) | | CVE-2019-9022 | Out-of-bounds Read / Denial of Service (DoS) | Hostile DNS responses could misuse memcpy , causing a read past an allocated buffer and leading to DoS or information disclosure. | High | 7.5 | | CVE-2019-9640 | Uninitialized Read / Information Disclosure | An uninitialized read in exif_process_IFD_in_MAKERNOTE within the EXIF component could lead to information disclosure. | Medium | 5.3 | | CVE-2019-9641 | Uninitialized Read / Information Disclosure | An uninitialized read in exif_process_IFD_in_TIFF within the EXIF component could lead to information disclosure. | Medium | 5.3 | | CVE-2020-7064 | Out-of-bounds Read | A one-byte out-of-bounds read that can be used to leak sensitive information from memory or cause a crash. | Medium | 5.3 | | CVE-2020-7066 | Input Validation Error (URL Truncation) | An issue in get_headers() that truncates URLs at a null ( \0 ) character, which could lead to incorrect assumptions and sending information to a wrong server. | Medium | 5.3 | | CVE-2020-7067 | Use-After-Free | A use-after-free vulnerability that could potentially be exploited to cause a crash or execute arbitrary code. | High | 7.5 | | CVE-2019-11044 | Input Validation Error | link() function accepts filenames with embedded null ( \0 ) byte, treating them as terminating at that byte, leading to path handling bypasses. | Medium | 5.3 | | CVE-2019-11045 | Input Validation Error | DirectoryIterator class accepts filenames with embedded null ( \0 ) byte, causing path truncation and potential security bypasses. | Medium | 5.3 | | CVE-2019-11046 | Buffer Under-read / Memory Disclosure | bcmath extension can be tricked into reading beyond allocated memory via crafted strings that appear numeric, leading to information disclosure. | Medium | 7.5 | | CVE-2019-9637, CVE-2019-9638, CVE-2019-9639 | EXIF Component Vulnerabilities | A set of issues within the EXIF component that could lead to various impacts, including DoS and information disclosure. | Medium | 5.3-7.5 |
An integer underflow in the _gdContributionsAlloc function that could have "unspecified impact". The "Verified" Risk Today
user wants a long article about verified vulnerabilities in PHP version 5.6.40. The keyword is "php version 5640 vulnerabilities verified". I need to provide a comprehensive overview. I'll need to gather information from multiple sources: official CVE databases, vulnerability databases, and security advisories. I'll start with a broad search to identify relevant vulnerabilities and then follow up with more targeted searches for specific CVEs. search results have provided a good starting point. I need to further investigate specific CVEs. I'll also look for general overviews and exploit information. have gathered information on various CVEs. I need to structure the article. The user likely wants a comprehensive overview. I will also search for "verified vulnerabilities php 5.6.40" to find any verification reports., I have a good collection of information. I'll structure the article with an introduction, lists of vulnerabilities in major categories, post-EOL risks, verification methods, and a concluding call to action. I will cite sources appropriately. I need to ensure the article is long and detailed, covering multiple vulnerabilities. I'll also check if there are any other major vulnerabilities like CVE-2019-9640 or CVE-2019-9641. have sufficient information to write the article. I will structure it as follows: Introduction; A summary table of vulnerabilities; Detailed discussions of critical vulnerabilities, memory safety issues, and input validation flaws; post-EOL risks; verification methods; and a concluding call to action. version 5.6.40, the final release in the PHP 5.x series, arrived on March 7, 2019, officially ending mainstream support on December 31, 2018. While it was a stable and widely deployed version at the time, its end-of-life (EOL) status makes it a significant security liability today. This article provides a detailed, verified overview of the critical security vulnerabilities affecting PHP 5.6.40.
In specific NGINX configurations utilizing a poorly constructed regular expression for path parsing, unauthenticated remote attackers could inject malicious commands via crafted query strings.