CVE-2019-19203

Name: CVE-2019-19203
Creator: NVD / NIST
Published: 2019-11-21T21:15:11.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.05%

Last modified Jun 17, 2026

CVE-2019-19203 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 4.05% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

4.05%

89.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions	Update
Oniguruma Project	Oniguruma	>= 6.0.0, < 6.9.4	—
Oniguruma Project	Oniguruma	6.9.4	Rc1
Fedoraproject	Fedora	30	—
Fedoraproject	Fedora	31	—

References

https://github.com/ManhNDd/CVE-2019-19203Exploit, Third Party Advisory
https://github.com/kkos/oniguruma/issues/163Exploit, Patch, Third Party Advisory
https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2Release Notes
https://github.com/tarantula-team/CVE-2019-19203Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBKD4J3YOU5V/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3MBNW6Z4DOXSCNWGBLQ7OA3OGUJ44WL/
https://github.com/ManhNDd/CVE-2019-19203Exploit, Third Party Advisory
https://github.com/kkos/oniguruma/issues/163Exploit, Patch, Third Party Advisory
https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2Release Notes
https://github.com/tarantula-team/CVE-2019-19203Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBKD4J3YOU5V/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3MBNW6Z4DOXSCNWGBLQ7OA3OGUJ44WL/

Timeline

Published: Nov 21, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-19203?

How severe is CVE-2019-19203?

CVE-2019-19203 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.05% probability of exploitation in the next 30 days.

How do I fix CVE-2019-19203?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-19203?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST