PHP version 8.4.20 (09 Apr 2026)

Bz2:

• Fix truncation of total output size causing erroneous errors. (ndossche)

Core:

• Fixed bugs GH-20875, GH-20873, GH-20854 (Propagate IN_GET guard in get_property_ptr_ptr for lazy proxies). (iliaal)

DOM:

• Fixed bug GH-21486 (Dom\HTMLDocument parser mangles xml:space and xml:lang attributes). (ndossche)

FFI:

• Fixed resource leak in FFI::cdef() onsymbol resolution failure. (David Carlier)

GD:

• Fixed bug GH-21431 (phpinfo() to display libJPEG 10.0 support). (David Carlier)

Opcache:

• Fixed bug GH-20838 (JIT compiler produces wrong arithmetic results). (Dmitry, iliaal)
• Fixed bug GH-21267 (JIT tracing: infinite loop on FETCH_OBJ_R with IS_UNDEF property in polymorphic context). (Dmitry, iliaal)
• Fixed bug GH-21395 (uaf in jit). (ndossche)

OpenSSL:

• Fixed bug GH-21083 (Skip private_key_bits validation for EC/curve-based keys). (iliaal)
• Fix missing error propagation for BIO_printf() calls. (ndossche)

PCRE:

• Fixed re-entrancy issue on php_pcre_match_impl, php_pcre_replace_impl, php_pcre_split_impl, and php_pcre_grep_impl. (David Carlier)

PGSQL:

• Fixed preprocessor silently guarding PGSQL_SUPPRESS_TIMESTAMPS support due to a typo. (KentarouTakeda)

SNMP:

• Fixed bug GH-21336 (SNMP::setSecurity() undefined behavior with NULL arguments). (David Carlier)

SOAP:

• Fixed Set-Cookie parsing bug wrong offset while scanning attributes. (David Carlier)

SPL:

• Fixed bug GH-21454 (missing write lock validation in SplHeap). (ndossche)

Standard:

• Fixed bug GH-20906 (Assertion failure when messing up output buffers). (ndossche)
• Fixed bug GH-20627 (Cannot identify some avif images with getimagesize). (y-guyon)

Sysvshm:

• Fix memory leak in shm_get_var() when variable is corrupted. (ndossche)

XSL:

• Fix GH-21357 (XSLTProcessor works with DOMDocument, but fails with Dom\XMLDocument). (ndossche)
• Fixed bug GH-21496 (UAF in dom_objects_free_storage). (David Carlier/ndossche)