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PHP 8.4 Thursday, 22 October 2026

PHP 8.4.27

93 changes across 30 components.

Core

  • Fixed GHSA-w8hw-w9fx-j79w, GHSA-6wmf-4rv5-p3rp (Avoid state corruption via bailout).
  • Fix GH-21999: GC inconsistency with lazy object, var_dump(), and object comparison.
  • Fixed OSS-Fuzz #536440507 (Immutable class incorrect assertion).
  • Fixed AVX being reported as supported when the OS has not enabled AVX state.
  • Fixed GH-23980 (ZEND_ASSERT violation @ ZEND_INCLUDE_OR_EVAL).
  • Fixed bug GH-23896 (Assertion failure in zend_call_function() after a throwing deprecation).
  • Fixed use-after-free when a dl()-loaded extension declares a frameless function and a later request calls it.
  • Fixed System V shared memory emulation for Windows attaching segments past the end of their mapping.
  • Fixed bug GH-24050 (GC frees an object still held by a resurrected closure when (object) and use share an array).
  • Fixed use-after-free when a Fiber callable resolves to $this of the method creating the Fiber ([A::class, 'm'] or "A::m") and that object dies before the Fiber runs.
  • Fixed exception thrown by destructor during GC in a Fiber not being rethrown into the frame that triggered the GC.
  • Fixed bug GH-24139 (NULL pointer dereference in php_ini.c when expand_filepath() fails).

BCMath

  • Fixed BcMath\Number results that truncate to zero keeping a negative sign and comparing less than zero.

BZ2

  • Fixed double close of the descriptor and use-after-free of the inner stream when bzopen() is given a stream resource.

CLI

  • Fix GH-22567 (Windows ZTS CLI SAPI should refresh its TSRMLS cache during request activation).
  • Fixed bug GH-23764 (Built-in server leaks a file descriptor on every HEAD request for a static file).
  • Fixed crash in the built-in server when a client is reset before being accepted.
  • Fixed the built-in server truncating an error page and leaking its unsent part after a partial socket write.

DOM

  • Fixed use-after-free when re-constructing a DOMXPath whose php:function registrations are freed while still reachable from the cycle collector.
  • Fixed bug GH-23365 (DOMNode::insertBefore($n, $n) drops the node and leaves a self-referencing sibling list).
  • Fixed Dom\HTMLDocument::getElementById() not finding ids of SVG and MathML elements.
  • Fixed Dom\HTMLDocument giving attributes the namespace of their element when a fragment is parsed with an xlink, xml or xmlns context element.
  • Fixed bug GH-23729 (DOMXPath::__construct() use-after-free during an evaluation).
  • Fixed bug GH-23897 (php:function() assertion failure after a failed registerPHPFunctions()).
  • Fixed DOMXPath and Dom\XPath losing the context node and in-scope namespaces of an evaluation after a php:function() callback evaluated another expression on the same object.

FFI

  • Fixed crashes with FFI callbacks created from __call() trampolines and array callables whose object is released.

FTP

  • Fixed bug GH-23619 (cryptic error on servers that don't support TLS session resumption on data connection).

GD

  • Fixed undefined behavior with GD2 images with `INT_MAX`-sized chunks.
  • Fixed undefined behavior with GIFs with problematic LZW compression data.

Intl

  • Fixed IntlDateFormatter::parse(), localtime() and parseToCalendar() treating the offset as UTF-16 code units instead of bytes.
  • Fixed cloning IntlDateFormatter and MessageFormatter losing PHP-side state such as dateType, timeType, calendar and the message pattern.
  • Fixed Collator attribute and strength methods not rejecting an unconstructed Collator.
  • Fixed grapheme_strstr() and grapheme_stristr() returning incorrect substrings when supplementary characters precede the match.
  • Fixed grapheme_strstr() and grapheme_strpos() missing canonically equivalent matches, and grapheme searches reporting ICU errors for empty haystacks.
  • Fixed grapheme_strrpos() and grapheme_strripos() skipping overlapping matches when using a negative offset.
  • Fixed grapheme_extract() returning an incorrect next offset when starting inside a multibyte UTF-8 character.

Lexbor

  • Merge patches lexbor/lexbor@8a14bc0 and lexbor/lexbor@f67ce4b, fixing a heap buffer overflow in :lexbor-contains() parsing and buffer overflows in malformed decode replay.

MBString

  • Fixed bug GH-23106 (mb_strpos() reads past the end of a haystack ending in a truncated UTF-8 sequence).
  • Fixed mbstring functions emitting surrogates in UTF-8 output and flagging it as valid UTF-8.

MySQLi

  • Fix GH-22854: Fixed failed assertion when accessing mysqli property after failed reconnection.

MySQLnd

  • Fixed field_count not resetting on OK packet.
  • Fixed memory leak when closing a prepared statement after its connection was killed.

Opcache

  • Fixed OSS-Fuzz #546798343 (Heap-buffer-overflow in optimizer with FCCs and inlining).
  • Fixed bug GH-23693 (Tracing JIT produces wrong results for a guard on a loop-invariant addition).
  • Fixed OSS-Fuzz #5674034779193344 (Read of uninitialized memory in is_cacheable_stream_path()).
  • Fix zend_analyze_calls() call_stack buffer overrun.
  • Fixed bug GH-23637 (PHP-FPM worker SIGSEGV: run_time_cache map_ptr offset beyond CG(map_ptr_last) when a class is reached through the CE cache).
  • Fix multiple incorrect DCE due to unsound escape analysis.
  • Fixed bug GH-24063 (OPcache optimizer folds `$cond ? -0.0 : 0.0` into a single `-0.0` constant).
  • Fixed crash when a file cache is reused with a different set of extensions declaring frameless functions.
  • Fixed bug GH-23991 (JIT generates invalid IR for multiple recursive calls).
  • Fix SCCP evaluation of isset()/empty() on dimension of non-escaping object.

OpenSSL

  • Fixed stream_socket_enable_crypto() leaving the socket non-blocking after a handshake timeout.
  • Fixed feof() on a TLS stream staying false after a close_notify on Windows.

PCNTL

  • Fixed pcntl_signal_dispatch() dropping the queued signals when it runs while an exception is pending.
  • Fixed pcntl_signal_dispatch() dropping the signals queued behind a handler that throws.
  • Fixed pcntl_setcpuaffinity() error message advertising the cpu count as the inclusive upper bound.
  • Fixed pcntl_setqos_class() requiring its optional $qos_class argument.
  • Fixed bug GH-23986 (/proc/self paths resolve to the parent process after pcntl_fork()).

PDO

  • Fixed PDOStatement::getColumnMeta() reading out of bounds for an invalid column index.
  • Fixed PDOStatement::bindColumn() registering a binding for a column name that is not in the result set.
  • Fixed PDOStatement::execute() leaving the previous result available after a failed execution.
  • Fixed a use-after-free when bindValue()/execute()/closeCursor() is called from a bound parameter's __toString() during execute().
  • Fixed bug GH-23962 (Destroying a persistent PDO instance rolls back a transaction still in use by another instance).
  • Fixed PDO::setAttribute() installing a PDO::ATTR_STATEMENT_CLASS class whose constructor arguments it rejects.
  • Fixed PDO::ATTR_STATEMENT_CLASS constructor_args type errors reporting "array given" regardless of the value passed.
  • Fixed PDOStatement::bindParam() and bindColumn() leaking the driver options value.
  • Fixed PDOStatement not reporting its bound parameters and columns to the cycle collector.
  • Fixed PDOStatement::setFetchMode() not applying changes atomically.

PDO_DBLIB

  • Fixed bug GH-23741 (segfault after a failed query inside a PDO transaction). Errors raised by beginTransaction(), commit(), rollBack() and lastInsertId() are now reported instead of being dropped.

PDO_Firebird

  • Fixed bug GH-23758 (PDO_Firebird returns null for non-null empty BLOBs).

Readline

  • Fixed a heap over-read in the interactive shell prompt when cli.prompt is set to an empty string.

Session

  • Fixed session_start() continuing after a failed create_sid() when session.use_strict_mode rejects the supplied ID.
  • Fixed exceptions from user-defined create_sid() handlers being replaced by return-value validation errors.

SimpleXML

  • Fixed reconstructing a SimpleXMLElement freeing a child element that another variable still references.

SOAP

  • Fixed bug GH-22895 (Heap use-after-free while encoding a Traversable with an illegal key).
  • Fixed memory leak when load_wsdl_ex() failed to load.

Sockets

  • Fixed socket_select() silently truncating sets larger than FD_SETSIZE on Windows.

SPL

  • Fixed SplFixedArray::setSize() doing nothing on subclasses whose constructor does not call parent::__construct().
  • Fixed memory leak when __construct(), __wakeup() or __unserialize() is called from an element destructor during setSize(0).

SQLite

  • Fixed a crash when SQLite3::close() is called from a userland callback.

Standard

  • Fixed sha1_file() returning a digest for incomplete data after a stream read failure.
  • Fixed iptcembed() corrupting JPEG headers when called recursively from an output handler.
  • Fixed proc_open() leaking descriptor zero when descriptor setup fails.
  • Fixed three Windows-only proc_open() defects: an uninitialized PROCESS_INFORMATION, an indeterminate comspec pointer after a failed lookup, and an unchecked CreateFileA() failure.
  • Fix persistent stream context lifetime during shutdown (Levi Morrison)
  • Fix wordwrap() ignoring an existing break at the end of the string (Nicolas Grekas)
  • Fixed convert.quoted-printable-decode decoding lowercase hex digits to the wrong byte.
  • Fixed unserialize() of enums sharing its state with the unserialize() calls made by autoloaders.

Tidy

  • Fixed a use-after-free when a tidyNode is used after its document is reparsed.

XSL

  • Fixed bug GH-23730 (use-after-free when XSLTProcessor::importStylesheet() is called during a transformation).

Zip

  • Fixed ZipArchive::extractTo() ignoring files given in a non-list array.
  • Fixed bug GH-23747 (ZipArchive::close() use-after-free from a progress or cancel callback).