Description
An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c.
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 | pcre2 | 10.34-1 | — |
| Debian 13 | pcre2 | 10.34-1 | — |
| Debian 12 | pcre2 | 10.34-1 | — |
| Debian 10 | pcre2 | 10.32-5+deb10u1 | DLA-3363-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | pcre2 | No fix yet | — |
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 | pcre2 +4 | 10.32-2.el8 | RHSA-2020:4539 |
| 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 |
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 | pcre2 +4 | 10.32-2.el8 | ALSA-2020:4539 |
| 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 | pcre2 | 10.32-2.el8 | RLSA-2020:4539 |
| 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 SP3 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLES 15 SP2 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLES 15 SP1 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLES 15 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP2 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLES for SAP 15 SP1 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLES for SAP 15 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLE Micro 5.2 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLE Micro 5.1 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLE HPC 15 SP2 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLE HPC 15 SP1 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SLE HPC 15 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SUSE Manager Server 4.1 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SUSE Manager Retail Branch Server 4.1 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SUSE Manager Proxy 4.1 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SUSE Enterprise Storage 7 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
| SUSE Enterprise Storage 6 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | pcre2 | 10.31-150000.3.12.1 | SUSE-SU-2022:2649-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | pcre2 | 10.31-150000.3.12.1 | openSUSE-SU-2022:2649-1 |
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 | pcre2 +4 | 10.32-2.el8 | ELSA-2020-4539 |
| 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 15
- ALSA-2020:3662 Moderate: php:7.3 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2020:4539 Moderate: pcre2 security and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0897 PCRE (Perl Compatible Regular Expressions): Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 6, 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
- WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- RHSA-2020:4539 Red Hat Security Advisory: pcre2 security and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- DLA-3363-1 pcre2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2020:4539 Moderate: pcre2 security and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2020:3662 Moderate: php:7.3 security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2022:2649-1 Security update for pcre2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2649-1 Security update for pcre2 SUSE / openSUSE Security Updates · Feb 4, 2026
- FSA-202302 Festo: Several vulnerabilities in FactoryViews CERT@VDE · Feb 2, 2026
- WID-SEC-2023-2229 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- ELSA-2020-4539 Moderate: pcre2 security and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020
- 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.exim.org/show_bug.cgi?id=2421
- https://bugs.php.net/bug.php?id=78338
- https://vcs.pcre.org/pcre2?view=revision&revision=1092
- https://bugzilla.redhat.com/show_bug.cgi?id=1735494
- GLSA-202006-16 vendor-advisory
- FEDORA-2020-b11cf352bd vendor-advisory
- [debian-lts-announce] 20230316 [SECURITY] [DLA 3363-1] pcre2 security update mailing-list