Description
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
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 | libonig | 6.9.4-1 | — |
| Debian 13 | libonig | 6.9.4-1 | — |
| Debian 12 | libonig | 6.9.4-1 | — |
| Debian 9 | libonig | 6.1.3-2+deb9u1 | DLA-2431-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libonig | 6.7.0-1ubuntu0.1~esm2 | USN-5662-1 |
| Ubuntu Pro 16.04 LTS | libonig | 5.9.6-1ubuntu0.1+esm3 | USN-5662-1 |
| Ubuntu Pro 14.04 LTS | libonig | 5.9.1-1ubuntu1.1+esm3 | USN-5662-1 |
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 | oniguruma +1 | 6.8.2-2.1.el8_9 | RHSA-2024:0889 |
| 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 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.8 EUS | oniguruma +1 | 6.8.2-2.1.el8_8 | RHSA-2024:0572 |
| RHEL 8.6 EUS | oniguruma +1 | 6.8.2-2.1.el8_6 | RHSA-2024:0409 |
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 | oniguruma +1 | 6.8.2-2.1.el8_9 | ALSA-2024:0889 |
| 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 SP4 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLES 15 SP3 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLES 15 SP2 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLES 15 SP1 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP2 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLES for SAP 15 SP1 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLE Micro 5.2 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLE Micro 5.1 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLE HPC 15 SP2 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SLE HPC 15 SP1 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SUSE Manager Server 4.1 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SUSE Manager Retail Branch Server 4.1 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SUSE Manager Proxy 4.1 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SUSE Enterprise Storage 7 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| SUSE Enterprise Storage 6 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | oniguruma | 6.9.7.1-1.2 | openSUSE-SU-2024:11111-1 |
| openSUSE Leap 15.4 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
| openSUSE Leap 15.3 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | oniguruma | 6.7.0-150000.3.3.1 | SUSE-SU-2022:3327-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | php +23 | 5.4.16-46.amzn2.0.6 | ALAS2-2025-2832 |
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 | oniguruma +1 | 6.8.2-2.1.el8_9 | ELSA-2024-0889 |
| 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 |
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 2 repositories
-
ManhNDd/CVE-2019-19203 ★ 3 · Nov 21, 2019
Heap-buffer-overflow in Oniguruma (function gb18030_mbc_enc_len)
-
tarantula-team/CVE-2019-19203 ★ 0 · Dec 24, 2019
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched …
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 17
- ALSA-2024:0889 Moderate: oniguruma security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2020:3662 Moderate: php:7.3 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2024-0218 Red Hat Enterprise Linux's oniguruma, tcpslice, c-ares: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 21, 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
- RHSA-2020:5275 Red Hat Security Advisory: rh-php73-php security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 18, 2026
- USN-5662-1 libonig vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- RHSA-2024:0889 Red Hat Security Advisory: oniguruma security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2024:0572 Red Hat Security Advisory: oniguruma security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2024:0409 Red Hat Security Advisory: oniguruma security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DLA-2431-1 libonig - 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-2022:3327-1 Security update for oniguruma SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11111-1 libonig5-6.9.7.1-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2025-2832 Important: php security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 30, 2025
- WID-SEC-2024-1086 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 19, 2025
- ELSA-2024-0889 Moderate: oniguruma security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 20, 2024
- ELSA-2020-3662 Moderate: php:7.3 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 9, 2020