Description
In PHP versions 7.2.x below 7.2.29, 7.3.x below 7.3.16 and 7.4.x below 7.4.4, while using get_headers() with user-supplied URL, if the URL contains zero (\0) character, the URL will be silently truncated at it. This may cause some software to make incorrect assumptions about the target of the get_headers() and possibly send some information to a wrong server.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PHP Group | PHP | 7.2.x below 7.2.29, 7.3.x below 7.3.16, 7.4.x below 7.4.4 | — |
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 | 7.4.5-1 | — |
| Debian 10 | php7.3 | 7.3.19-1~deb10u1 | DSA-4719-1 |
| Debian 9 | php7.0 | 7.0.33-0+deb9u8 | DSA-4717-1 |
| Debian 8 | php5 | 5.6.40+dfsg-0+deb8u11 | DLA-2188-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | php7.4 | 7.4.3-4ubuntu1.1 | USN-4330-2 |
| Ubuntu 18.04 LTS | php7.2 | 7.2.24-0ubuntu0.18.04.4 | USN-4330-1 |
| Ubuntu 16.04 LTS | php7.0 | 7.0.33-0ubuntu0.16.04.14 | USN-4330-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | php5 | 5.5.9+dfsg-1ubuntu4.29+esm11 | USN-4330-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | apcu-panel +2 | 5.1.17-1.module+el8.1.0+3189+a1bff096 | RHSA-2020:3662 |
| RHEL 8 | libzip +2 | 1.5.2-1.module+el8.1.0+3189+a1bff096 | RHSA-2020:3662 |
| RHEL 8 | php +25 | 7.3.20-1.module+el8.2.0+7373+b272fdef | RHSA-2020:3662 |
| RHEL 8 | php-pear | 1:1.10.9-1.module+el8.1.0+3189+a1bff096 | RHSA-2020:3662 |
| RHEL 8 | php-pecl-rrd | 2.0.1-1.module+el8.2.0+4968+1d5097db | RHSA-2020:3662 |
| RHEL 8 | php-pecl-xdebug | 2.8.0-1.module+el8.2.0+4968+1d5097db | RHSA-2020:3662 |
| RHEL 8 | php-pecl-zip | 1.15.4-1.module+el8.1.0+3189+a1bff096 | RHSA-2020:3662 |
| RHEL 3 | rh-php73-php +27 | 7.3.20-1.el7 | RHSA-2020:5275 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | apcu-panel +2 | 5.1.17-1.module_el8.3.0+2009+b272fdef | ALSA-2020:3662 |
| AlmaLinux 8 | libzip +2 | 1.5.2-1.module_el8.3.0+2009+b272fdef | ALSA-2020:3662 |
| AlmaLinux 8 | php +25 | 7.3.20-1.module_el8.3.0+2009+b272fdef | ALSA-2020:3662 |
| AlmaLinux 8 | php-pear | 1:1.10.9-1.module_el8.3.0+2009+b272fdef | ALSA-2020:3662 |
| AlmaLinux 8 | php-pecl-rrd | 2.0.1-1.module_el8.3.0+2009+b272fdef | ALSA-2020:3662 |
| AlmaLinux 8 | php-pecl-xdebug | 2.8.0-1.module_el8.3.0+2009+b272fdef | ALSA-2020:3662 |
| AlmaLinux 8 | php-pecl-zip | 1.15.4-1.module_el8.3.0+2009+b272fdef | ALSA-2020:3662 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | libzip | 1.5.2-1.module+el8.4.0+414+2e7afcdd | RLSA-2020:3662 |
| Rocky Linux 8 | php | 7.3.20-1.module+el8.4.0+414+2e7afcdd | RLSA-2020:3662 |
| Rocky Linux 8 | php-pear | 1:1.10.9-1.module+el8.4.0+414+2e7afcdd | RLSA-2020:3662 |
| Rocky Linux 8 | php-pecl-apcu | 5.1.17-1.module+el8.4.0+414+2e7afcdd | RLSA-2020:3662 |
| Rocky Linux 8 | php-pecl-rrd | 2.0.1-1.module+el8.4.0+414+2e7afcdd | RLSA-2020:3662 |
| Rocky Linux 8 | php-pecl-xdebug | 2.8.0-1.module+el8.4.0+414+2e7afcdd | RLSA-2020:3662 |
| Rocky Linux 8 | php-pecl-zip | 1.15.4-1.module+el8.4.0+414+2e7afcdd | RLSA-2020:3662 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | php7 | 7.2.5-4.55.7 | SUSE-SU-2022:4067-1, SUSE-SU-2020:1199-1 |
| SLES 15 SP1 | tidy | 5.4.0-3.2.1 | SUSE-SU-2020:1199-1 |
| SLES 15 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4067-1 |
| SLES 12 SP5 | php72 | 7.2.5-1.46.1 | SUSE-SU-2020:1546-1 |
| SLES 12 SP4 | php5 | 5.5.14-109.76.1 | SUSE-SU-2020:1714-1 |
| SLES 12 SP4 | php72 | 7.2.5-1.46.1 | SUSE-SU-2020:1546-1 |
| SLES 12 | php5 | 5.5.14-109.76.1 | SUSE-SU-2020:1714-1 |
| SLES 12 | php72 | 7.2.5-1.46.1 | SUSE-SU-2020:1546-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4067-1 |
| SLES for SAP 15 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4067-1 |
| SLE HPC 15 SP1 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4067-1 |
| SLE HPC 15 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4067-1 |
| SUSE Enterprise Storage 6 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4067-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | php7 | 7.2.34-150000.4.103.1 | SUSE-SU-2022:4067-1 |
| openSUSE Leap 15.1 | php7 +1 | 7.2.5-lp151.6.25.1 | openSUSE-SU-2020:0642-1 |
| openSUSE Leap 15.1 | tidy | 5.4.0-lp151.3.3.1 | openSUSE-SU-2020:0642-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.15 | php7 | 7.3.16-r0 | — |
| Alpine v3.14 | php7 | 7.3.16-r0 | — |
| Alpine v3.13 | php7 | 7.3.16-r0 | — |
| Alpine v3.12 | php7 | 7.3.16-r0 | — |
| Alpine v3.11 | php7 | 7.3.16-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.9 | php7 | 7.2.31-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | apcu-panel +2 | 5.1.17-1.module+el8.2.0+5569+98c8b30d | ELSA-2020-3662 |
| Oracle Linux 8 | libzip +2 | 1.5.2-1.module+el8.2.0+5569+98c8b30d | ELSA-2020-3662 |
| Oracle Linux 8 | php +25 | 7.3.20-1.module+el8.2.0+7784+4033621d | ELSA-2020-3662 |
| Oracle Linux 8 | php-pear | 1:1.10.9-1.module+el8.2.0+5569+98c8b30d | ELSA-2020-3662 |
| Oracle Linux 8 | php-pecl-rrd | 2.0.1-1.module+el8.2.0+5569+98c8b30d | ELSA-2020-3662 |
| Oracle Linux 8 | php-pecl-xdebug | 2.8.0-1.module+el8.2.0+5569+98c8b30d | ELSA-2020-3662 |
| Oracle Linux 8 | php-pecl-zip | 1.15.4-1.module+el8.2.0+5569+98c8b30d | ELSA-2020-3662 |
Advisories 18
- ALSA-2020:3662 Moderate: php:7.3 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2020:5275 Red Hat Security Advisory: rh-php73-php security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 18, 2026
- RHSA-2020:3662 Red Hat Security Advisory: php:7.3 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 18, 2026
- USN-4330-2 php7.4 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4330-1 php5, php7.0, php7.2, php7.3 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4719-1 php7.3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4717-1 php7.0 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2188-1 php5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2020:3662 Moderate: php:7.3 security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2022:4067-1 Security update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1199-1 Security update for php7 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1714-1 Security update for php5 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1546-1 Security update for php72 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0642-1 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
- ELSA-2020-3662 Moderate: php:7.3 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 9, 2020
References
- https://bugs.php.net/bug.php?id=79329
- https://security.netapp.com/advisory/ntap-20200403-0001/
- [debian-lts-announce] 20200426 [SECURITY] [DLA 2188-1] php5 security update mailing-list
- USN-4330-2 vendor-advisory
- openSUSE-SU-2020:0642 vendor-advisory
- DSA-4717 vendor-advisory
- DSA-4719 vendor-advisory
- https://www.tenable.com/security/tns-2021-14