PHP version 8.4.18 (12 Feb 2026)

Core:

• Fixed bug GH-20837 (NULL dereference when calling ob_start() in shutdown function triggered by bailout in php_output_lock_error()). (timwolla)
• Fix OSS-Fuzz #471533782 (Infinite loop in GC destructor fiber). (ilutov)
• Fix OSS-Fuzz #472563272 (Borked block_pass JMP[N]Z optimization). (ilutov)
• Fixed bug GH-GH-20914 (Internal enums can be cloned and compared). (Arnaud)
• Fix OSS-Fuzz #474613951 (Leaked parent property default value). (ilutov)
• Fixed bug GH-20766 (Use-after-free in FE_FREE with GC interaction). (Bob)
• Fix OSS-Fuzz #471486164 (Broken by-ref assignment to uninitialized hooked backing value). (ilutov)
• Fix OSS-Fuzz #438780145 (Nested finally with repeated return type check may uaf). (ilutov)
• Fixed bug GH-20905 (Lazy proxy bailing __clone assertion). (ilutov)
• Fixed bug GH-20479 (Hooked object properties overflow). (ndossche)

DOM:

• Fixed GH-21041 (Dom\HTMLDocument corrupts closing tags within scripts). (lexborisov)

MbString:

• Fixed bug GH-20833 (mb_str_pad() divide by zero if padding string is invalid in the encoding). (ndossche)
• Fixed bug GH-20836 (Stack overflow in mb_convert_variables with recursive array references). (alexandre-daubois)

Opcache:

• Fixed bug GH-20818 (Segfault in Tracing JIT with object reference). (khasinski)

OpenSSL:

• Fix memory leaks when sk_X509_new_null() fails. (ndossche)
• Fix crash when in openssl_x509_parse() when i2s_ASN1_INTEGER() fails. (ndossche)
• Fix crash in openssl_x509_parse() when X509_NAME_oneline() fails. (ndossche)

Phar:

• Fixed bug GH-20882 (buildFromIterator breaks with missing base directory). (ndossche)

PGSQL:

• Fixed INSERT/UPDATE queries building with PQescapeIdentifier() and possible UB. (David Carlier)

Readline:

• Fixed bug GH-18139 (Memory leak when overriding some settings via readline_info()). (ndossche)

SPL:

• Fixed bug GH-20856 (heap-use-after-free in SplDoublyLinkedList iterator when modifying during iteration). (ndossche)

Standard:

• Fixed bug #74357 (lchown fails to change ownership of symlink with ZTS) (Jakub Zelenka)
• Fixed bug GH-20843 (var_dump() crash with nested objects) (David Carlier)