CVE-2019-19246 [High] | Out-of-bounds Read in Oniguruma

CVE-2019-19246 is rated Moderate Risk (46.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.23%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-09	0.30%	0.23%	-0.07%
2	2026-01-20	0.19%	0.30%	+0.11%
3	2025-11-21	—	0.19%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-09

0.30%

0.23%

-0.07%

2026-01-20

0.19%

0.30%

+0.11%

2025-11-21

—

0.19%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/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:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/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:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

2.9

[email protected]

OS Trackers for CVE-2019-19246

vendor	priority	summary	link
`debian`	low	CVE-2019-19246 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-2019-19246
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2019-19246
`suse`	high	CVE-2019-19246 severity important: SUSE including 286 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, …), 451 product×package rows across 150 product lines (Container bci/php, Container bci/php-apache, … (150 product lines)): Fixed 336, Known Affected 100, Will Not Fix 15.	https://www.suse.com/security/cve/CVE-2019-19246/
`ubuntu`	medium	CVE-2019-19246 medium priority: Ubuntu including 1 source packages (libonig), 13 status rows across 13 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): not-affected 7, released 3, ignored 2, needs-triage 1.	https://ubuntu.com/security/CVE-2019-19246

Affected software / configurations for CVE-2019-19246

Vendor	Product	Version	Raw CPE
oniguruma_project	oniguruma	<= 6.9.3	cpe:2.3:a:oniguruma_project:oniguruma::::::::
php	php	>= 7.3.0, < 7.3.10	cpe:2.3:a:php:php::::::::
fedoraproject	fedora	31	cpe:2.3:o:fedoraproject:fedora:31:::::::*
canonical	ubuntu_linux	14.04	cpe:2.3:o:canonical:ubuntu_linux:14.04::::esm:::
debian	debian_linux	8.0	cpe:2.3:o:debian:debian_linux:8.0:::::::*

References for CVE-2019-19246

URL	Tags
https://bugs.php.net/bug.php?id=78559	Third Party Advisory
https://github.com/kkos/oniguruma/commit/d3e402928b6eb3327f8f7d59a9edfa622fec557b	Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00002.html	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBKD4J3YOU5V/
https://usn.ubuntu.com/4460-1/	Third Party Advisory

URL

CVE-2019-19246

Exploit prediction scoring system (EPSS) score for CVE-2019-19246

Common vulnerability scoring system (CVSS) metrics for CVE-2019-19246

Weakness enumeration for CVE-2019-19246

OS Trackers for CVE-2019-19246

Affected software / configurations for CVE-2019-19246

References for CVE-2019-19246