PHP version 8.4.25 (27 Aug 2026)

Core:

• Fixed bug GH-23088 (Stack overflow when comparing deeply nested arrays). (Lazizbek Ergashev)

Date:

• Fixed leak on double DatePeriod::__construct() call. (ilutov)

DOM:

• Fixed bug GH-23116 (Stack overflow when normalizing a deeply nested DOMDocument). (Lazizbek Ergashev)
• Fixed bug GH-23117 (Stack overflow when normalizing a deeply nested Dom\XMLDocument). (Lazizbek Ergashev)
• Fixed bug GH-22825 (DOMElement::setAttribute() fails silently when the DTD declares a default value for the attribute). (iliaal)
• Fixed bug GH-22447 (UAF at dom_objects_free_storage when setting an attribute node that collides by local name with a namespaced attribute). (David Carlier)
• Fixed bug GH-23120 (Stack overflow when comparing deeply nested DOM nodes with DOMNode::isEqualNode()). (Weilin Du)

LibXML:

• Fixed bug GH-22752 (Build failure with libxml 2.15). (David Carlier)

MBString:

• Fixed bug GH-22779 (mb_strrpos() returns the wrong position for a negative offset in a non-UTF-8 encoding). (Eyüp Can Akman)
• Fixed bug GH-21036 (mb_ereg_search_getregs() crashes after mb_eregi() invalidates the regex cache). (Matthias Goergens)

Opcache:

• Fixed bug GH-22857 (Function JIT emits wrong code for FETCH_OBJ_FUNC_ARG on a property hook getter, losing register-held variables). (Zhao Hao)

OpenSSL:

• Fix missing error check on invalid alpn protocols. (ndossche)

Opcache:

• Fixed bug GH-22916 (Preserve parent regs in zend_jit_deoptimizer_start()). (Arnaud)

PCRE:

• Fixed bug GH-21134 (Crash with \C + UTF-8). Using \C in UTF-8 patterns is now forbidden. (Arnaud)

Reflection:

• Fixed bug GH-22905 (Reflection exception messages truncate on null bytes). (DanielEScherzer)
• Fixed ReflectionProperty::isLazy() and skipLazyInitialization() using the parent slot when a child class hooks an inherited property. (iliaal)
• Fixed segfault in ReflectionMethod::createFromMethodName() on an uninstantiable subclass. (iliaal)

Session:

• Fix corruption in mod_mm. (ndossche)
• Fixed bug GH-23043 (broken session id code can cause zend_mm_heap corrupted). (ndossche)

SimpleXML:

• Fixed integer element offsets that cannot resolve aliasing an existing element. (iliaal)
• Fixed segfault when comparing uninitialized SimpleXMLElement instances. (iliaal)

Sockets:

• Fixed various memory related issues in ext/sockets. (David Carlier)

SQLite:

• Fix leak when trying to close db if blob stream is still open. (ndossche)

Standard:

• Fixed bug GH-23111 (Stack overflow in array_walk_recursive() with deeply nested arrays). (Lazizbek Ergashev)
• Fixed bug GH-23113 (Stack overflow in array_replace_recursive() with deeply nested arrays). (Lazizbek Ergashev)
• Fixed bug GH-23115 (Stack overflow in compact() with deeply nested arrays). (Lazizbek Ergashev)
• Fixed stack overflow in count() with COUNT_RECURSIVE and deeply nested arrays. (Lazizbek Ergashev)

Streams:

• Fixed bug GH-15836 (Use-after-free when a user stream filter accesses $this->stream during the close flush). (iliaal)

Sysvshm:

• Fixed out-of-bounds write when shm_attach() opens an existing segment with a size larger than the segment actually is. (David Carlier)

XSL:

• Fixed use-after-free when a DOMDocument subclass __clone() retains the stylesheet copy made by XSLTProcessor::importStylesheet(). (iliaal)