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PHP Group php php 8.5 Update Version 8.5.5

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Update Summary

PHP 8.5.5 delivers fixes across the core engine, JIT, DOM, OpenSSL, Phar, PCRE, and other extensions, including memory-safety, parser, resource-leak, and correctness issues.

Update Details

Security

  • Fixed use-after-free issues in the JIT compiler, compressed Phar entry unlinking, and DOM object storage cleanup.
  • Fixed PCRE re-entrancy issues affecting matching, replacement, splitting, and grep operations.
  • Fixed undefined behavior in SNMP::setSecurity() when passed NULL arguments.
  • Added missing write-lock validation in SplHeap.
  • Fixed an FFI resource leak when cdef() symbol resolution fails.
  • Fixed OpenSSL error propagation and private-key validation handling for EC and curve-based keys.

Bug Fixes

  • Corrected property_info sizing for locally shadowed trait properties and propagated the IN_GET guard for lazy proxies.
  • Fixed Bz2 output-size truncation that caused erroneous errors.
  • Corrected Dom\HTMLDocument parsing of xml:space and xml:lang attributes.
  • Updated phpinfo() to correctly display libJPEG 10.0 support.
  • Fixed propagation of preloaded constants to file-cached scripts.
  • Corrected JIT arithmetic results and prevented infinite tracing loops for undefined object properties in polymorphic contexts.
  • Fixed signal-handler installation on AIX by increasing num_signals storage.
  • Fixed SOAP Set-Cookie parsing offsets.
  • Fixed assertion failures when output buffers are mismanaged.
  • Improved AVIF image identification in getimagesize().
  • Fixed a memory leak in shm_get_var() when a variable is corrupted.
  • Fixed XSLTProcessor compatibility with Dom\XMLDocument.

Product Information

Vendor: PHP Group

Product: php

Product type: Software

Variant: php 8.5

Version: 8.5.5

Vendor information published: Apr 9, 2026

Original release notes: View on vendor site

Published on updatealert.io: Oct 28, 2026

Description: A popular general-purpose scripting language that is especially suited to web development. Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.

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