CVE-2019-13224

A use-after-free in onig_new_deluxe() in regext.c in Oniguruma 6.9.2 allows attackers to potentially cause information disclosure, denial of service, or possibly code execution by providing a crafted regular expression. The attacker provides a pair of a regex pattern and a string, with a multi-byte encoding that gets handled by onig_new_deluxe(). Oniguruma issues often affect Ruby, as well as common optional libraries for PHP and Rust.

Published: 2019-07-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-13224 is rated High Risk (73.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.05%). EPSS rose +3.50% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-13224

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.55% 4.05% +3.50%
2 2025-12-03 0.71% 0.55% -0.17%
3 2025-11-21 — 0.71% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-13224

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2019-13224

OS Trackers for CVE-2019-13224

vendor priority summary link
alpine critical CVE-2019-13224: 1 source package rows (php7); 1 state rows across 1 repos (edge-community); fixed 1, open 0. https://security.alpinelinux.org/vuln/CVE-2019-13224
debian low CVE-2019-13224 low priority: Debian including 1 source packages (libonig), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-13224
gentoo high CVE-2019-13224: 1 GLSA(s) (201911-03), 1 atom(s) (dev-libs/oniguruma); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-13224
redhat medium — https://access.redhat.com/security/cve/CVE-2019-13224
suse medium CVE-2019-13224 severity moderate: SUSE including 288 source package names (1.0.1-2.1:libonig4-6.7.0-150000.3.3.1, 1.5.1-1.5.1:libonig4-6.7.0-150000.3.3.1, …), 465 product×package rows across 156 product lines (Container bci/php, Container bci/php-apache, … (156 product lines)): Fixed 338, Known Affected 100, Known Not Affected 27. https://www.suse.com/security/cve/CVE-2019-13224/
ubuntu medium CVE-2019-13224 medium priority: Ubuntu including 8 source packages (groonga, libevhtp, …), 152 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 80, not-affected 21, released 17, ignored 16, needed 10, needs-triage 8. https://ubuntu.com/security/CVE-2019-13224

Affected software / configurations for CVE-2019-13224

Vendor Product Version Raw CPE
oniguruma_project oniguruma 6.9.2 cpe:2.3:a:oniguruma_project:oniguruma:6.9.2:-:*:*:*:*:*:*
php php >= 7.1.0, < 7.1.32 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.2.0, < 7.2.23 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.3.0, < 7.3.9 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
fedoraproject fedora 30 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*

References for CVE-2019-13224

cvelogic Threat Intelligence