Description
In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode(), pass signed char to ctype functions (like isxdigit()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PHP Group | PHP | 8.2.* – < 8.2.31, 8.3.* – < 8.3.31, 8.4.* – < 8.4.21, 8.5.* – < 8.5.6 | 8.2.31 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | php8.4 | 8.4.21-1 | — |
| Debian 13 | php8.4 | 8.4.21-1~deb13u1 | — |
| Debian 12 | php8.2 | 8.2.31-1~deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | php8.5 | 8.5.4-0ubuntu1.1 | — |
| Ubuntu 25.10 | php8.4 | 8.4.11-1ubuntu1.2 | — |
| Ubuntu 24.04 LTS | php8.3 | 8.3.6-0ubuntu0.24.04.9 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | php +23 | 8.3.31-1.el10_2 | RHSA-2026:23388 |
| RHEL 10 | php8.4 +23 | 8.4.21-1.el10_2 | RHSA-2026:22649 |
| RHEL 9 | apcu-panel +2 | 5.1.23-1.module+el9.6.0+22647+1741ae35 | RHSA-2026:22143, RHSA-2026:22142 |
| RHEL 9 | php +23 | 8.0.30-6.el9_8 | RHSA-2026:33449, RHSA-2026:22143, RHSA-2026:22142 |
| RHEL 9 | php-pecl-redis6 | 6.1.0-2.module+el9.6.0+22647+1741ae35 | RHSA-2026:22142 |
| RHEL 9 | php-pecl-rrd | 2.0.3-4.module+el9.6.0+22647+1741ae35 | RHSA-2026:22143, RHSA-2026:22142 |
| RHEL 9 | php-pecl-xdebug3 | 3.2.2-2.module+el9.7.0+24111+199d2cc4 | RHSA-2026:22143, RHSA-2026:22142 |
| RHEL 9 | php-pecl-zip | 1.22.3-1.module+el9.6.0+22647+1741ae35 | RHSA-2026:22143, RHSA-2026:22142 |
| RHEL 8 | apcu-panel +2 | 5.1.18-1.module+el8.10.0+22485+a3539972 | RHSA-2026:34354, RHSA-2026:22305 |
| RHEL 8 | libzip +2 | 1.6.1-1.module+el8.10.0+22485+a3539972 | RHSA-2026:34354, RHSA-2026:22305 |
| RHEL 8 | php +25 | 7.4.33-4.module+el8.10.0+24352+91532d3e | RHSA-2026:34354, RHSA-2026:22305 |
| RHEL 8 | php-pear | 1:1.10.13-1.module+el8.10.0+22485+a3539972 | RHSA-2026:34354, RHSA-2026:22305 |
| RHEL 8 | php-pecl-rrd | 2.0.1-1.module+el8.10.0+22485+a3539972 | RHSA-2026:34354, RHSA-2026:22305 |
| RHEL 8 | php-pecl-xdebug | 2.9.5-1.module+el8.10.0+22485+a3539972 | RHSA-2026:34354 |
| RHEL 8 | php-pecl-xdebug3 | 3.2.2-2.module+el8.10.0+20798+00eaeb41 | RHSA-2026:22305 |
| RHEL 8 | php-pecl-zip | 1.18.2-1.module+el8.10.0+22485+a3539972 | RHSA-2026:34354, RHSA-2026:22305 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | php +26 | 8.5.6-1.hum1 | RHSA-2026:14125 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | php +23 | 8.3.31-1.el10_2 | ALSA-2026:23388 |
| AlmaLinux 10 | php8.4 +23 | 8.4.21-1.el10_2 | ALSA-2026:22649 |
| AlmaLinux 9 | apcu-panel +2 | 5.1.23-1.module_el9.4.0+65+49ff6472 | ALSA-2026:22143, ALSA-2026:22142 |
| AlmaLinux 9 | php +23 | 8.0.30-6.el9_8 | ALSA-2026:33449, ALSA-2026:22143, ALSA-2026:22142 |
| AlmaLinux 9 | php-pecl-redis6 | 6.1.0-2.module_el9.6.0+151+5f31e576 | ALSA-2026:22142 |
| AlmaLinux 9 | php-pecl-rrd | 2.0.3-4.module_el9.4.0+65+49ff6472 | ALSA-2026:22143, ALSA-2026:22142 |
| AlmaLinux 9 | php-pecl-xdebug3 | 3.2.2-2.module_el9.4.0+65+49ff6472 | ALSA-2026:22143, ALSA-2026:22142 |
| AlmaLinux 9 | php-pecl-zip | 1.22.3-1.module_el9.4.0+65+49ff6472 | ALSA-2026:22143, ALSA-2026:22142 |
| AlmaLinux 8 | apcu-panel +2 | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2026:34354, ALSA-2026:22305 |
| AlmaLinux 8 | libzip +1 | 1.6.1-1.module_el8.6.0+2750+78feabcb | ALSA-2026:34354, ALSA-2026:22305 |
| AlmaLinux 8 | libzip-devel | 1.6.1-1.module_el8.6.0+3239+bedf0508 | ALSA-2026:34354, ALSA-2026:22305 |
| AlmaLinux 8 | php +25 | 7.4.33-4.module_el8.10.0+4209+2ed16ff0 | ALSA-2026:34354, ALSA-2026:22305 |
| AlmaLinux 8 | php-pear | 1:1.10.13-1.module_el8.10.0+3935+28808425 | ALSA-2026:34354, ALSA-2026:22305 |
| AlmaLinux 8 | php-pecl-rrd | 2.0.1-1.module_el8.6.0+2750+78feabcb | ALSA-2026:34354, ALSA-2026:22305 |
| AlmaLinux 8 | php-pecl-xdebug | 2.9.5-1.module_el8.6.0+2750+78feabcb | ALSA-2026:34354 |
| AlmaLinux 8 | php-pecl-xdebug3 | 3.2.2-2.module_el8.10.0+3796+30ed3ef7 | ALSA-2026:22305 |
| AlmaLinux 8 | php-pecl-zip | 1.18.2-1.module_el8.6.0+2750+78feabcb | ALSA-2026:34354, ALSA-2026:22305 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | php | 8.3.31-1.el10_2 | RLSA-2026:23388 |
| Rocky Linux 10 | php8.4 | 8.4.21-1.el10_2 | RLSA-2026:22649 |
| Rocky Linux 9 | php | 8.0.30-6.el9_8 | RLSA-2026:33449 |
| Rocky Linux 9 | php-pecl-apcu | 5.1.23-1.module+el9.7.0+40004+bf50a568 | RLSA-2026:22143, RLSA-2026:22142 |
| Rocky Linux 9 | php-pecl-redis6 | 6.1.0-2.module+el9.7.0+40005+715283ec | RLSA-2026:22142 |
| Rocky Linux 9 | php-pecl-rrd | 2.0.3-4.module+el9.7.0+40003+454ed3c4 | RLSA-2026:22143, RLSA-2026:22142 |
| Rocky Linux 9 | php-pecl-xdebug3 | 3.2.2-2.module+el9.7.0+40004+bf50a568 | RLSA-2026:22143, RLSA-2026:22142 |
| Rocky Linux 9 | php-pecl-zip | 1.22.3-1.module+el9.7.0+40004+bf50a568 | RLSA-2026:22143, RLSA-2026:22142 |
| Rocky Linux 8 | libzip | 1.6.1-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:34354, RLSA-2026:22305 |
| Rocky Linux 8 | php-pear | 1:1.10.13-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:34354, RLSA-2026:22305 |
| Rocky Linux 8 | php-pecl-apcu | 5.1.18-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:34354, RLSA-2026:22305 |
| Rocky Linux 8 | php-pecl-rrd | 2.0.1-1.module+el8.4.0+414+2e7afcdd | RLSA-2026:34354, RLSA-2026:22305 |
| Rocky Linux 8 | php-pecl-xdebug | 2.9.5-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:34354 |
| Rocky Linux 8 | php-pecl-xdebug3 | 3.2.2-2.module+el8.10.0+1596+477f03f8 | RLSA-2026:22305 |
| Rocky Linux 8 | php-pecl-zip | 1.18.2-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:34354, RLSA-2026:22305 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | php8 | 8.5.6-1.1 | openSUSE-SU-2026:10747-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | php83 | 8.3.31-r0 | — |
| Alpine v3.24 | php84 | 8.4.21-r0 | — |
| Alpine v3.24 | php85 | 8.5.6-r0 | — |
| Alpine v3.23 | php83 | 8.3.31-r0 | — |
| Alpine v3.23 | php84 | 8.4.21-r0 | — |
| Alpine v3.23 | php85 | 8.5.6-r0 | — |
| Alpine v3.22 | php82 | 8.2.31-r0 | — |
| Alpine v3.22 | php83 | 8.3.36-r0 | — |
| Alpine v3.22 | php84 | 8.4.27-r0 | — |
| Alpine v3.19 | php81 | 8.1.34-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | php8.2 +27 | 8.2.31-1.amzn2023.0.1 | ALAS2023-2026-1727 |
| Amazon Linux 2023 | php8.3 +28 | 8.3.31-1.amzn2023.0.1 | ALAS2023-2026-1728 |
| Amazon Linux 2023 | php8.4 +27 | 8.4.21-1.amzn2023.0.1 | ALAS2023-2026-1726 |
| Amazon Linux 2023 | php8.5 +26 | 8.5.6-1.amzn2023.0.1 | ALAS2023-2026-1733 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | php | 8.3.31-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | php +23 | 8.3.31-1.el10_2 | ELSA-2026-23388 |
| Oracle Linux 10 | php8.4 +23 | 8.4.21-1.el10_2 | ELSA-2026-22649 |
| Oracle Linux 9 | apcu-panel +2 | 5.1.23-1.module+el9.4.0+90261+af5cc950 | ELSA-2026-22143, ELSA-2026-22142 |
| Oracle Linux 9 | php +23 | 8.0.30-6.el9_8 | ELSA-2026-33449, ELSA-2026-22143, ELSA-2026-22142 |
| Oracle Linux 9 | php-pecl-redis6 | 6.1.0-2.module+el9.8.0+90900+909102f6 | ELSA-2026-22142 |
| Oracle Linux 9 | php-pecl-rrd | 2.0.3-4.module+el9.4.0+90261+af5cc950 | ELSA-2026-22143, ELSA-2026-22142 |
| Oracle Linux 9 | php-pecl-xdebug3 | 3.2.2-2.module+el9.4.0+90261+af5cc950 | ELSA-2026-22143, ELSA-2026-22142 |
| Oracle Linux 9 | php-pecl-zip | 1.22.3-1.module+el9.4.0+90261+af5cc950 | ELSA-2026-22143, ELSA-2026-22142 |
| Oracle Linux 8 | apcu-panel +2 | 5.1.18-1.module+el8.10.0+90472+f810484b | ELSA-2026-34354, ELSA-2026-22305 |
| Oracle Linux 8 | libzip +2 | 1.6.1-1.module+el8.10.0+90472+f810484b | ELSA-2026-34354, ELSA-2026-22305 |
| Oracle Linux 8 | php +25 | 7.4.33-4.module+el8.10.0+90942+d80f51f3 | ELSA-2026-34354, ELSA-2026-22305 |
| Oracle Linux 8 | php-pear | 1:1.10.13-1.module+el8.10.0+90472+f810484b | ELSA-2026-34354, ELSA-2026-22305 |
| Oracle Linux 8 | php-pecl-rrd | 2.0.1-1.module+el8.10.0+90472+f810484b | ELSA-2026-34354, ELSA-2026-22305 |
| Oracle Linux 8 | php-pecl-xdebug | 2.9.5-1.module+el8.10.0+90472+f810484b | ELSA-2026-34354 |
| Oracle Linux 8 | php-pecl-xdebug3 | 3.2.2-2.module+el8.10.0+90469+8883f508 | ELSA-2026-22305 |
| Oracle Linux 8 | php-pecl-zip | 1.18.2-1.module+el8.10.0+90472+f810484b | ELSA-2026-34354, ELSA-2026-22305 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | php-8.2 | 8.2.31-r0 | — |
Advisories 36
- ALSA-2026:22142 Important: php:8.3 security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:22649 Important: php8.4 security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:23388 Important: php security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:22143 Important: php:8.2 security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:22305 Important: php:8.2 security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:33449 Important: php security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:34354 Important: php:7.4 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2455 Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- WID-SEC-2026-1433 PHP: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 21, 2026
- RHSA-2026:14125 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- RHSA-2026:34354 Red Hat Security Advisory: php:7.4 security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:33449 Red Hat Security Advisory: php security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:23388 Red Hat Security Advisory: php security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:22649 Red Hat Security Advisory: php8.4 security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:22305 Red Hat Security Advisory: php:8.2 security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:22143 Red Hat Security Advisory: php:8.2 security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RHSA-2026:22142 Red Hat Security Advisory: php:8.3 security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RLSA-2026:33449 Important: php security update Rocky Linux Security Advisories · Jul 29, 2026
- ELSA-2026-22649 Important: php8.4 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 17, 2026
- ELSA-2026-23388 Important: php security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- ALAS2023-2026-1726 Important: php8.4 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 13, 2026
- ALAS2023-2026-1733 Important: php8.5 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 13, 2026
- RLSA-2026:34354 Important: php:7.4 security update Rocky Linux Security Advisories · Jul 2, 2026
- ELSA-2026-33449 Important: php security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 2, 2026
- ELSA-2026-34354 Important: php:7.4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 2, 2026
- ELSA-2026-22142 Important: php:8.3 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- ELSA-2026-22143 Important: php:8.2 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- RLSA-2026:23388 Important: php security update Rocky Linux Security Advisories · Jun 6, 2026
- RLSA-2026:22649 Important: php8.4 security update Rocky Linux Security Advisories · Jun 5, 2026
- ELSA-2026-22305 Important: php:8.2 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 3, 2026
- RLSA-2026:22305 Important: php:8.2 security update Rocky Linux Security Advisories · Jun 1, 2026
- RLSA-2026:22142 Important: php:8.3 security update Rocky Linux Security Advisories · Jun 1, 2026
- RLSA-2026:22143 Important: php:8.2 security update Rocky Linux Security Advisories · Jun 1, 2026
- ALAS2023-2026-1727 Important: php8.2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 26, 2026
- ALAS2023-2026-1728 Important: php8.3 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 26, 2026
- openSUSE-SU-2026:10747-1 php8-8.5.6-1.1 on GA media SUSE / openSUSE Security Updates · May 12, 2026