Name: CVE-2026-17544: Out-of-bounds Write
Creator: Rapid7
Published: 2026-07-30T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-17544, CWE-787, CVSS 9.8, EPSS 0.00418

Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.

CVSS Details

CVSS 4.0 Base Score: 8.1 (HIGH)
CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 9.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade php84Upgrade php85	Aug 6, 2026	Jul 30, 2026
Amazon_linux_2023	—	Upgrade php8.4-develUpgrade php8.5-mysqlndUpgrade php8.5-sodiumUpgrade php8.4-soapUpgrade php8.4-xml-debuginfoUpgrade php8.4-zipUpgrade php8.5-tidyUpgrade php8.4-dbg-debuginfoUpgrade php8.5-odbc-debuginfoUpgrade php8.4-debugsourceUpgrade php8.5-develUpgrade php8.5-mbstring-debuginfoUpgrade php8.4-embedded-debuginfoUpgrade php8.4-sodium-debuginfoUpgrade php8.5-commonUpgrade php8.4-pdoUpgrade php8.4-fpmUpgrade php8.5-debugsourceUpgrade php8.5-pgsql-debuginfoUpgrade php8.4-tidy-debuginfoUpgrade php8.4-zip-debuginfoUpgrade php8.4-mbstringUpgrade php8.4-tidyUpgrade php8.4-opcache-debuginfoUpgrade php8.5-ldap-debuginfoUpgrade php8.5-bcmathUpgrade php8.4-cliUpgrade php8.5-pgsqlUpgrade php8.5-pdoUpgrade php8.4-process-debuginfoUpgrade php8.4-snmpUpgrade php8.4-sodiumUpgrade php8.5-soap-debuginfoUpgrade php8.4Upgrade php8.5-dbgUpgrade php8.4-dba-debuginfoUpgrade php8.5-modphp-debuginfoUpgrade php8.4-common-debuginfoUpgrade php8.5-snmp-debuginfoUpgrade php8.4-odbcUpgrade php8.4-fpm-debuginfoUpgrade php8.5-debuginfoUpgrade php8.5-modphpUpgrade php8.5-mysqlnd-debuginfoUpgrade php8.5-gdUpgrade php8.5-zip-debuginfoUpgrade php8.4-opcacheUpgrade php8.5-soapUpgrade php8.5-gmpUpgrade php8.5-odbcUpgrade php8.5-gmp-debuginfoUpgrade php8.4-intlUpgrade php8.5-pdo-debuginfoUpgrade php8.5-intlUpgrade php8.4-enchantUpgrade php8.5-dbg-debuginfoUpgrade php8.5-bcmath-debuginfoUpgrade php8.4-ffiUpgrade php8.4-debuginfoUpgrade php8.4-commonUpgrade php8.4-pdo-debuginfoUpgrade php8.4-bcmathUpgrade php8.4-ldapUpgrade php8.4-gdUpgrade php8.5-dbaUpgrade php8.5-process-debuginfoUpgrade php8.5-zipUpgrade php8.5-xmlUpgrade php8.5-gd-debuginfoUpgrade php8.4-pgsql-debuginfoUpgrade php8.4-ldap-debuginfoUpgrade php8.4-gd-debuginfoUpgrade php8.4-ffi-debuginfoUpgrade php8.4-cli-debuginfoUpgrade php8.5-sodium-debuginfoUpgrade php8.4-enchant-debuginfoUpgrade php8.5-snmpUpgrade php8.5-common-debuginfoUpgrade php8.5-cliUpgrade php8.4-modphp-debuginfoUpgrade php8.4-gmp-debuginfoUpgrade php8.4-dbaUpgrade php8.4-bcmath-debuginfoUpgrade php8.5-xml-debuginfoUpgrade php8.5-intl-debuginfoUpgrade php8.5-embedded-debuginfoUpgrade php8.5-embeddedUpgrade php8.4-xmlUpgrade php8.4-mysqlndUpgrade php8.4-mbstring-debuginfoUpgrade php8.4-embeddedUpgrade php8.4-pgsqlUpgrade php8.5-dba-debuginfoUpgrade php8.5-tidy-debuginfoUpgrade php8.5-enchant-debuginfoUpgrade php8.4-snmp-debuginfoUpgrade php8.4-odbc-debuginfoUpgrade php8.4-modphpUpgrade php8.5-ffi-debuginfoUpgrade php8.5Upgrade php8.4-intl-debuginfoUpgrade php8.4-dbgUpgrade php8.5-processUpgrade php8.5-enchantUpgrade php8.4-gmpUpgrade php8.5-ldapUpgrade php8.4-processUpgrade php8.5-mbstringUpgrade php8.5-ffiUpgrade php8.5-fpmUpgrade php8.5-fpm-debuginfoUpgrade php8.5-cli-debuginfoUpgrade php8.4-mysqlnd-debuginfoUpgrade php8.4-soap-debuginfo	Aug 18, 2026	Jul 30, 2026
Debian	—	Upgrade php8.4	Aug 2, 2026	Aug 2, 2026
Oracle_linux	—	Upgrade php8.4-ldapUpgrade php8.4-snmpUpgrade php8.4-bcmathUpgrade php8.4-fpmUpgrade php8.4-dbaUpgrade php8.4-enchantUpgrade php8.4-xmlUpgrade php8.4-commonUpgrade php8.4-ffiUpgrade php8.4-gdUpgrade php8.4-cliUpgrade php8.4-processUpgrade php8.4-soapUpgrade php8.4-dbgUpgrade php8.4-gmpUpgrade php8.4-mysqlndUpgrade php8.4-embeddedUpgrade php8.4-odbcUpgrade php8.4-opcacheUpgrade php8.4-develUpgrade php8.4-pdoUpgrade php8.4-mbstringUpgrade php8.4Upgrade php8.4-pgsqlUpgrade php8.4-intl	Oct 22, 2026	Jul 30, 2026
Redhat_linux	—	Upgrade php8.4-enchant-debuginfoUpgrade php8.4-bcmath-debuginfoUpgrade php8.4-mbstring-debuginfoUpgrade php8.4-odbcUpgrade php8.4-debuginfoUpgrade php8.4-dbaUpgrade php8.4-dbgUpgrade php8.4-snmpUpgrade php8.4-opcache-debuginfoUpgrade php8.4-debugsourceUpgrade php8.4-gdUpgrade php8.4-gmp-debuginfoUpgrade php8.4-processUpgrade php8.4-gmpUpgrade php8.4-develUpgrade php8.4-fpm-debuginfoUpgrade php8.4-ldapUpgrade php8.4-pdo-debuginfoUpgrade php8.4-dba-debuginfoUpgrade php8.4-xmlUpgrade php8.4-pgsqlUpgrade php8.4-xml-debuginfoUpgrade php8.4-bcmathUpgrade php8.4-commonUpgrade php8.4-snmp-debuginfoUpgrade php8.4-intl-debuginfoUpgrade php8.4-pdoUpgrade php8.4Upgrade php8.4-odbc-debuginfoUpgrade php8.4-process-debuginfoUpgrade php8.4-ldap-debuginfoUpgrade php8.4-fpmUpgrade php8.4-enchantUpgrade php8.4-ffiUpgrade php8.4-embeddedUpgrade php8.4-mysqlndUpgrade php8.4-embedded-debuginfoUpgrade php8.4-dbg-debuginfoUpgrade php8.4-cli-debuginfoNo solution existsUpgrade php8.4-mbstringUpgrade php8.4-gd-debuginfoUpgrade php8.4-pgsql-debuginfoUpgrade php8.4-opcacheUpgrade php8.4-mysqlnd-debuginfoUpgrade php8.4-ffi-debuginfoUpgrade php8.4-soapUpgrade php8.4-common-debuginfoUpgrade php8.4-intlUpgrade php8.4-cliUpgrade php8.4-soap-debuginfo	Aug 6, 2026	Jul 30, 2026
Rocky_linux	—	Upgrade php8.4-cli-debuginfoUpgrade php8.4-intl-debuginfoUpgrade php8.4-odbcUpgrade php8.4-opcache-debuginfoUpgrade php8.4-ffiUpgrade php8.4-gmpUpgrade php8.4-debugsourceUpgrade php8.4-odbc-debuginfoUpgrade php8.4-gmp-debuginfoUpgrade php8.4-opcacheUpgrade php8.4-pgsql-debuginfoUpgrade php8.4-snmpUpgrade php8.4-dbaUpgrade php8.4-mbstringUpgrade php8.4-commonUpgrade php8.4-fpm-debuginfoUpgrade php8.4-process-debuginfoUpgrade php8.4-dba-debuginfoUpgrade php8.4-mbstring-debuginfoUpgrade php8.4-fpmUpgrade php8.4-enchant-debuginfoUpgrade php8.4-pdo-debuginfoUpgrade php8.4-soap-debuginfoUpgrade php8.4-debuginfoUpgrade php8.4-ldap-debuginfoUpgrade php8.4-ffi-debuginfoUpgrade php8.4-enchantUpgrade php8.4-xml-debuginfoUpgrade php8.4-mysqlnd-debuginfoUpgrade php8.4-dbg-debuginfoUpgrade php8.4Upgrade php8.4-embeddedUpgrade php8.4-bcmathUpgrade php8.4-processUpgrade php8.4-xmlUpgrade php8.4-cliUpgrade php8.4-gd-debuginfoUpgrade php8.4-gdUpgrade php8.4-develUpgrade php8.4-dbgUpgrade php8.4-common-debuginfoUpgrade php8.4-bcmath-debuginfoUpgrade php8.4-mysqlndUpgrade php8.4-ldapUpgrade php8.4-pgsqlUpgrade php8.4-intlUpgrade php8.4-embedded-debuginfoUpgrade php8.4-soapUpgrade php8.4-snmp-debuginfoUpgrade php8.4-pdo	Aug 24, 2026	Aug 20, 2026
Ubuntu	—	Upgrade libapache2-mod-php8.5Upgrade php8.5-cliUpgrade php8.5-fpmUpgrade php8.5-cgi	Sep 14, 2026	Sep 10, 2026

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CVSS Details

Covered by Rapid7

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