An unauthenticated remote attacker can pass a specially crafted multibyte string sequence to any input field processed by affected mbstring functions. This triggers an out-of-bounds memory write, allowing arbitrary code execution with the permissions of the underlying web server user account (e.g., www-data ). 2. PHAR Archive Arbitrary Data Disclosure
Never upgrade your live site directly. Set up a staging site that mimics your production environment.
One of the most critical structural flaws in PHP 5.6 involves object injection vulnerabilities during the handling of serialized data. php version 5640 vulnerabilities link
Look into premium extended security maintenance (ESM) tracks.
In the quiet, humming rows of a forgotten data center, a server named "Old Faithful" still ran a relic: . Released on January 10, 2019, this was the final curtain call for the PHP 5.6 branch, a version that had powered the web for years but was now officially unsupported and "End of Life" . An unauthenticated remote attacker can pass a specially
PHP 5.6.40 is a special version in PHP's history—it's the final release of the entire PHP 5 branch. Released on January 10, 2019, it capped off a series that began with PHP 5.0 in 2004. But here's the critical catch: PHP 5.6 officially reached end-of-life (EOL) on December 31, 2018, meaning its developer community had already stopped offering security fixes before 5.6.40 came out. That's why , and this article gives you a clear, actionable guide: a complete list of vulnerabilities, their fixes, and a practical plan to move off PHP 5.6 for good.
Improper implementation of memory operations in functions like gdImageColorMatch CVE-2019-6977 PHAR Archive Arbitrary Data Disclosure Never upgrade your
4. GD Graphics Library Deficiencies (CVE-2019-6977 & CVE-2016-10166)
| CVE ID | Description | Potential Impact | |---|---|---| | | Integer underflow in _gdContributionsAlloc function | Denial of service (DoS), memory corruption, arbitrary code execution (CVSS v3 score: 9.8) | | CVE-2019-6977 | Heap-based buffer overflow in gdImageColorMatch | Complete system compromise via crafted image data | | CVE-2019-9020 | Heap-based buffer over-read in xmlrpc_decode | Heap out-of-bounds read, read-after-free → complete system compromise | | CVE-2019-9021 | Heap-based buffer over-read in PHAR extension | Sensitive information disclosure via crafted file name | | CVE-2019-9023 | Multiple heap-based buffer over-reads in mbstring regex | Memory corruption → full system compromise via crafted multi-byte sequences | | CVE-2019-9024 | Out-of-bounds read in xmlrpc_decode | Memory read beyond allocated regions via malicious XMLRPC server | | CVE-2019-11043 | Buffer underflow in php5-fpm (only certain Nginx configurations) | Remote code execution (RCE) – extremely severe |