Description
In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PHP Group | PHP | 7.3.x – < 7.3.33, 7.4.x – < 7.4.26, 8.0.X – < 8.0.13 | 7.3.33 |
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 11 | php7.4 | 7.4.28-1+deb11u1 | DSA-5082-1 |
| Debian 10 | php7.3 | 7.3.31-1~deb10u2 | DLA-3243-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | php7.4 | 7.4.3-4ubuntu2.10 | USN-5300-2 |
| Ubuntu 18.04 LTS | php7.2 | 7.2.24-0ubuntu0.18.04.11 | USN-5300-2 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | php7.0 | 7.0.33-0ubuntu0.16.04.16+esm3 | USN-5300-1 |
| Ubuntu Pro 14.04 LTS | php5 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | apcu-panel +2 | 5.1.18-1.module+el8.3.0+6678+b09f589e | RHSA-2022:7628 |
| RHEL 8 | libzip +2 | 1.6.1-1.module+el8.3.0+6678+b09f589e | RHSA-2022:7628 |
| RHEL 8 | php +25 | 7.4.30-1.module+el8.7.0+15886+8e29b882 | RHSA-2022:7628 |
| RHEL 8 | php-pear | 1:1.10.13-1.module+el8.7.0+15127+a450a8db | RHSA-2022:7628 |
| RHEL 8 | php-pecl-rrd | 2.0.1-1.module+el8.3.0+6678+b09f589e | RHSA-2022:7628 |
| RHEL 8 | php-pecl-xdebug | 2.9.5-1.module+el8.3.0+6678+b09f589e | RHSA-2022:7628 |
| RHEL 8 | php-pecl-zip | 1.18.2-1.module+el8.3.0+6678+b09f589e | RHSA-2022:7628 |
| RHEL 3 | rh-php73-php +27 | 7.3.33-1.el7 | RHSA-2022:5491 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | apcu-panel +2 | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2022:7628 |
| AlmaLinux 8 | libzip +2 | 1.6.1-1.module_el8.6.0+2750+78feabcb | ALSA-2022:7628 |
| AlmaLinux 8 | php +25 | 7.4.30-1.module_el8.7.0+3286+227f3cf0 | ALSA-2022:7628 |
| AlmaLinux 8 | php-pear | 1:1.10.13-1.module_el8.6.0+3268+b150a051 | ALSA-2022:7628 |
| AlmaLinux 8 | php-pecl-rrd | 2.0.1-1.module_el8.6.0+2750+78feabcb | ALSA-2022:7628 |
| AlmaLinux 8 | php-pecl-xdebug | 2.9.5-1.module_el8.6.0+2750+78feabcb | ALSA-2022:7628 |
| AlmaLinux 8 | php-pecl-zip | 1.18.2-1.module_el8.6.0+2750+78feabcb | ALSA-2022:7628 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | libzip | 1.6.1-1.module+el8.4.0+415+e936cba3 | RLSA-2022:7628 |
| Rocky Linux 8 | php | 7.4.30-1.module+el8.7.0+1067+0a7071cc | RLSA-2022:7628 |
| Rocky Linux 8 | php-pear | 1:1.10.13-1.module+el8.6.0+1006+0d5a469f | RLSA-2022:7628 |
| Rocky Linux 8 | php-pecl-apcu | 5.1.18-1.module+el8.4.0+415+e936cba3 | RLSA-2022:7628 |
| Rocky Linux 8 | php-pecl-rrd | 2.0.1-1.module+el8.4.0+414+2e7afcdd | RLSA-2022:7628 |
| Rocky Linux 8 | php-pecl-xdebug | 2.9.5-1.module+el8.4.0+415+e936cba3 | RLSA-2022:7628 |
| Rocky Linux 8 | php-pecl-zip | 1.18.2-1.module+el8.4.0+415+e936cba3 | RLSA-2022:7628 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | php7 +4 | 7.4.25-150400.4.8.1 | SUSE-SU-2022:3997-1, SUSE-SU-2022:2292-1 |
| SLES 15 SP4 | php8 +5 | 8.0.10-150400.4.8.1 | SUSE-SU-2022:2303-1 |
| SLES 15 SP3 | php7 | 7.4.6-3.29.1 | SUSE-SU-2022:4069-1, SUSE-SU-2021:3943-1 |
| SLES 15 SP2 | php7 | 7.4.6-3.29.1 | SUSE-SU-2022:4069-1, SUSE-SU-2021:3943-1 |
| SLES 15 SP1 | php7 | 7.2.5-4.89.4 | SUSE-SU-2022:4067-1, SUSE-SU-2022:0679-1 |
| SLES 15 | php7 | 7.2.5-4.89.4 | SUSE-SU-2022:4067-1, SUSE-SU-2022:0679-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | php72 | 7.2.5-1.75.1 | SUSE-SU-2022:0577-1 |
| SLES 12 SP5 | php74 | 7.4.6-1.30.1 | SUSE-SU-2022:4068-1, SUSE-SU-2021:3927-1 |
| SLES 12 | php72 | 7.2.5-1.75.1 | SUSE-SU-2022:0577-1 |
| SLES 12 | php74 | 7.4.6-1.30.1 | SUSE-SU-2022:4068-1, SUSE-SU-2021:3927-1 |
| SLES for SAP 15 SP2 | php7 | 7.4.33-150200.3.46.2 | SUSE-SU-2022:4069-1 |
| SLES for SAP 15 SP1 | php7 | 7.2.5-4.89.4 | SUSE-SU-2022:4067-1, SUSE-SU-2022:0679-1 |
| SLES for SAP 15 | php7 | 7.2.5-4.89.4 | SUSE-SU-2022:4067-1, SUSE-SU-2022:0679-1 |
| SLE HPC 15 SP2 | php7 | 7.4.33-150200.3.46.2 | SUSE-SU-2022:4069-1 |
| SLE HPC 15 SP1 | php7 | 7.2.5-4.89.4 | SUSE-SU-2022:4067-1, SUSE-SU-2022:0679-1 |
| SLE HPC 15 | php7 | 7.2.5-4.89.4 | SUSE-SU-2022:4067-1, SUSE-SU-2022:0679-1 |
| SUSE Manager Server 4.1 | php7 | 7.4.33-150200.3.46.2 | SUSE-SU-2022:4069-1 |
| SUSE Manager Retail Branch Server 4.1 | php7 | 7.4.33-150200.3.46.2 | SUSE-SU-2022:4069-1 |
| SUSE Manager Proxy 4.1 | php7 | 7.4.33-150200.3.46.2 | SUSE-SU-2022:4069-1 |
| SUSE Enterprise Storage 7 | php7 | 7.4.33-150200.3.46.2 | SUSE-SU-2022:4069-1 |
| SUSE Enterprise Storage 6 | php7 | 7.2.5-4.89.4 | SUSE-SU-2022:4067-1, SUSE-SU-2022:0679-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | php7 | 7.4.26-1.1 | openSUSE-SU-2024:11640-1 |
| openSUSE Tumbleweed | php8 | 8.0.13-1.1 | openSUSE-SU-2024:11638-1 |
| openSUSE Leap 15.4 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4069-1, SUSE-SU-2022:4067-1, SUSE-SU-2022:3997-1 |
| openSUSE Leap 15.4 | php7-fpm +4 | 7.4.25-150400.4.8.1 | SUSE-SU-2022:3997-1, SUSE-SU-2022:2292-1 |
| openSUSE Leap 15.4 | php8 +5 | 8.0.10-150400.4.8.1 | SUSE-SU-2022:2303-1 |
| openSUSE Leap 15.3 | php7 +1 | 7.4.6-3.29.1 | openSUSE-SU-2021:3943-1, SUSE-SU-2022:4069-1 |
| openSUSE Leap 15.2 | php7 +1 | 7.4.6-lp152.2.21.1 | openSUSE-SU-2021:1570-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | php81 | 8.1.0-r0 | — |
| Alpine v3.18 | php81 | 8.1.0-r0 | — |
| Alpine v3.17 | php81 | 8.1.0-r0 | — |
| Alpine v3.16 | php8 | 8.0.13-r0 | — |
| Alpine v3.16 | php81 | 8.1.0-r0 | — |
| Alpine v3.15 | php7 | 7.4.26-r0 | — |
| Alpine v3.15 | php8 | 8.0.13-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.14 | php7 | 7.4.26-r0 | — |
| Alpine v3.14 | php8 | 8.0.13-r0 | — |
| Alpine v3.13 | php7 | 7.4.26-r0 | — |
| Alpine v3.13 | php8 | 8.0.13-r0 | — |
| Alpine v3.12 | php7 | 7.3.33-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | apcu-panel +2 | 5.1.18-1.module+el8.3.0+7685+72d70b58 | ELSA-2022-7628 |
| Oracle Linux 8 | libzip +2 | 1.6.1-1.module+el8.3.0+7685+72d70b58 | ELSA-2022-7628 |
| Oracle Linux 8 | php +25 | 7.4.30-1.module+el8.7.0+20800+8e29b882 | ELSA-2022-7628 |
| Oracle Linux 8 | php-pear | 1:1.10.13-1.module+el8.7.0+20800+8e29b882 | ELSA-2022-7628 |
| Oracle Linux 8 | php-pecl-rrd | 2.0.1-1.module+el8.3.0+7685+72d70b58 | ELSA-2022-7628 |
| Oracle Linux 8 | php-pecl-xdebug | 2.9.5-1.module+el8.3.0+7685+72d70b58 | ELSA-2022-7628 |
| Oracle Linux 8 | php-pecl-zip | 1.18.2-1.module+el8.3.0+7685+72d70b58 | ELSA-2022-7628 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
useru1k/php-8.1.0-dev-exploit ★ 0 · Sep 8, 2025
Exploit for the PHP 8.1.0-dev backdoor vulnerability (CVE-2021-21707)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 31
- ALSA-2022:7628 Moderate: php:7.4 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0432 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2022-0302 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2022:7628 Red Hat Security Advisory: php:7.4 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2022:5491 Red Hat Security Advisory: rh-php73-php security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-5300-1 php7.0 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- VDE-2024-017 Pepperl+Fuchs: ICE2- * and ICE3- * are affected by multiple vulnerabilities CERT@VDE · May 18, 2026
- USN-5300-2 php7.2, php7.4 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5082-1 php7.4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3243-1 php7.3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:7628 Moderate: php:7.4 security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2021:3943-1 Recommended update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4067-1 Security update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11640-1 php7-7.4.26-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0679-1 Security update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2303-1 Security update for php8 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11638-1 php8-8.0.13-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3997-1 Security update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0577-1 Security update for php72 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3927-1 Security update for php74 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2292-1 Security update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3943-1 Recommended update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1570-1 Recommended update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4068-1 Security update for php74 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4069-1 Security update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- FSA-202302 Festo: Several vulnerabilities in FactoryViews CERT@VDE · Feb 2, 2026
- ICSA-26-027-02 Festo Didactic SE MES PC CISA ICS & IT advisories · Jan 27, 2026
- FSA-202402 Several Vulnerabilities in MES PC (Windows 10) CERT@VDE · Dec 8, 2025
- WID-SEC-2022-0587 PHP: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Sep 13, 2023
- WID-SEC-2023-1737 Juniper Patchday Juli 2023 BSI CERT-Bund (WID) · Jul 12, 2023
- ELSA-2022-7628 Moderate: php:7.4 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 15, 2022