Description
An integer overflow in the search_in_range function in regexec.c in Oniguruma 6.x before 6.9.4_rc2 leads to an out-of-bounds read, in which the offset of this read is under the control of an attacker. (This only affects the 32-bit compiled version). Remote attackers can cause a denial-of-service or information disclosure, or possibly have unspecified other impact, via a crafted regular expression.
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 |
| Debian 8 | libonig | 5.9.5-3.2+deb8u4 | DLA-2020-1 |
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+esm2 | USN-5662-1 |
| Ubuntu Pro 14.04 LTS | libonig | 5.9.1-1ubuntu1.1+esm2 | USN-5662-1, USN-4460-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | oniguruma +1 | 6.8.2-2.1.el8_9 | RHSA-2024:0889 |
| RHEL 8 | ruby +4 | 2.5.9-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-abrt +1 | 0.3.0-4.module+el8.10.0+22021+135c76a8 | RHSA-2025:7539 |
| RHEL 8 | rubygem-bigdecimal | 1.3.4-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-bson +1 | 4.3.0-2.module+el8.9.0+19193+435404ae | RHSA-2025:7539 |
| RHEL 8 | rubygem-bundler +1 | 1.16.1-5.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-did_you_mean | 1.2.0-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-io-console | 0.4.6-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-json | 2.1.0-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-minitest | 5.10.3-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-mongo +1 | 2.5.1-2.module+el8.9.0+19193+435404ae | RHSA-2025:7539 |
| RHEL 8 | rubygem-mysql2 +1 | 0.4.10-4.module+el8.9.0+19193+435404ae | RHSA-2025:7539 |
| RHEL 8 | rubygem-net-telnet | 0.1.1-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-openssl | 2.1.2-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-pg +1 | 1.0.0-3.module+el8.9.0+19193+435404ae | RHSA-2025:7539 |
| RHEL 8 | rubygem-power_assert | 1.1.1-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-psych | 3.0.2-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-rake | 12.3.3-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-rdoc | 6.0.1.1-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-test-unit | 3.2.7-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygem-xmlrpc | 0.3.0-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
| RHEL 8 | rubygems +1 | 2.7.6.3-114.module+el8.10.0+23088+750dc6ca | RHSA-2025:7539 |
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 | oniguruma +1 | 6.8.2-2.1.el8_9 | ALSA-2024:0889 |
| AlmaLinux 8 | ruby +4 | 2.5.9-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-abrt | 0.3.0-4.module_el8.5.0+2625+ec418553 | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-abrt-doc | 0.3.0-4.module_el8.10.0+3871+342e2c2f | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-bigdecimal | 1.3.4-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-bson | 4.3.0-2.module_el8.5.0+259+8cec6917 | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-bson-doc | 4.3.0-2.module_el8.5.0+2625+ec418553 | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-bundler +1 | 1.16.1-5.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-did_you_mean | 1.2.0-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-io-console | 0.4.6-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-json | 2.1.0-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-minitest | 5.10.3-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-mongo +1 | 2.5.1-2.module_el8.5.0+2625+ec418553 | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-mysql2 | 0.4.10-4.module_el8.5.0+259+8cec6917 | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-mysql2-doc | 0.4.10-4.module_el8.5.0+2625+ec418553 | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-net-telnet | 0.1.1-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-openssl | 2.1.2-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-pg +1 | 1.0.0-3.module_el8.9.0+3635+c6f99506 | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-power_assert | 1.1.1-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-psych | 3.0.2-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-rake | 12.3.3-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-rdoc | 6.0.1.1-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-test-unit | 3.2.7-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygem-xmlrpc | 0.3.0-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
| AlmaLinux 8 | rubygems +1 | 2.7.6.3-114.module_el8.10.0+3991+5e651d4e | ALSA-2025:7539 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | ruby | 2.5.9-114.module+el8.10.0+1979+815637df | RLSA-2025:7539 |
| Rocky Linux 8 | rubygem-abrt | 0.3.0-4.module+el8.5.0+738+032c9c02 | RLSA-2025:7539 |
| Rocky Linux 8 | rubygem-bson | 4.3.0-2.module+el8.9.0+1536+5f79634e | RLSA-2025:7539 |
| Rocky Linux 8 | rubygem-bundler | 1.16.1-5.module+el8.10.0+1979+815637df | RLSA-2025:7539 |
| Rocky Linux 8 | rubygem-mongo | 2.5.1-2.module+el8.9.0+1536+5f79634e | RLSA-2025:7539 |
| Rocky Linux 8 | rubygem-mysql2 | 0.4.10-4.module+el8.9.0+1536+5f79634e | RLSA-2025:7539 |
| Rocky Linux 8 | rubygem-pg | 1.0.0-3.module+el8.9.0+1536+5f79634e | RLSA-2025:7539 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | oniguruma | 6.9.7.1-1.2 | openSUSE-SU-2024:11111-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | oniguruma +1 | 5.9.6-1.amzn2.0.3 | ALAS2-2020-1380 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | oniguruma +1 | 6.8.2-2.1.el8_9 | ELSA-2024-0889 |
| Oracle Linux 8 | ruby +4 | 2.5.9-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-abrt +1 | 0.3.0-4.module+el8.10.0+90367+ae9e8511 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-bigdecimal | 1.3.4-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-bson +1 | 4.3.0-2.module+el8.9.0+90042+a65659a6 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-bundler +1 | 1.16.1-5.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-did_you_mean | 1.2.0-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-io-console | 0.4.6-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-json | 2.1.0-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-minitest | 5.10.3-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-mongo +1 | 2.5.1-2.module+el8.9.0+90042+a65659a6 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-mysql2 +1 | 0.4.10-4.module+el8.9.0+90042+a65659a6 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-net-telnet | 0.1.1-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-openssl | 2.1.2-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-pg +1 | 1.0.0-3.module+el8.9.0+90042+a65659a6 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-power_assert | 1.1.1-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-psych | 3.0.2-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-rake | 12.3.3-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-rdoc | 6.0.1.1-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-test-unit | 3.2.7-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygem-xmlrpc | 0.3.0-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
| Oracle Linux 8 | rubygems +1 | 2.7.6.3-114.module+el8.10.0+90580+29305b94 | ELSA-2025-7539 |
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-2019-19012 ★ 4 · Nov 20, 2019
Integer overflow in Oniguruma
-
tarantula-team/CVE-2019-19012 ★ 0 · Nov 20, 2019
An integer overflow in the search_in_range function in regexec.c in Oniguruma 6.x before 6.9.4_rc2 leads to an out-of-bounds read
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-2025:7539 Moderate: ruby:2.5 security 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-2025:7539 Red Hat Security Advisory: ruby:2.5 security update Red Hat Security Advisories (RHSA) · Aug 7, 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
- USN-4460-1 libonig vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-2020-1 libonig - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2431-1 libonig - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11111-1 libonig5-6.9.7.1-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1086 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 19, 2025
- RLSA-2025:7539 Moderate: ruby:2.5 security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-7539 Moderate: ruby:2.5 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 16, 2025
- ELSA-2024-0889 Moderate: oniguruma security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 20, 2024
- ALAS2-2020-1380 Moderate: oniguruma security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 8, 2020
References
- https://github.com/kkos/oniguruma/issues/164
- https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2
- https://github.com/tarantula-team/CVE-2019-19012
- FEDORA-2019-d942abd0d4 vendor-advisory
- [debian-lts-announce] 20191204 [SECURITY] [DLA 2020-1] libonig security update mailing-list
- FEDORA-2019-73197ff9a0 vendor-advisory
- USN-4460-1 vendor-advisory