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Vulnerability record · CVE-2019-19204 · published 21 November 2019

CVE-2019-19204: Oniguruma project oniguruma out-of-bounds read vulnerability

OOniguruma Project · Oniguruma

An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function fetch_interval_quantifier (formerly known as fetch_range_quantifier) in regparse.c, PFETCH is called without checking PEND. This leads to a heap-based buffer over-read.

7.5 CVSS 3.1 High EPSS 6.9% · top 6.2% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score, v2 5.0
6.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
16References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function fetch_interval_quantifier (formerly known as fetch_range_quantifier) in regparse.c, PFETCH is called without checking PEND. This leads to a heap-based buffer over-read.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ManhNDd/CVE-2019-19204 ExploitThird Party Advisory
https://github.com/kkos/oniguruma/issues/162 ExploitPatchThird Party Advisory
https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2 Release Notes
https://github.com/tarantula-team/CVE-2019-19204 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00002.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3MBNW6Z4DOXSCNWGBLQ7OA
https://usn.ubuntu.com/4460-1/
https://github.com/ManhNDd/CVE-2019-19204 ExploitThird Party Advisory
https://github.com/kkos/oniguruma/issues/162 ExploitPatchThird Party Advisory
https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2 Release Notes
https://github.com/tarantula-team/CVE-2019-19204 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00002.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3MBNW6Z4DOXSCNWGBLQ7OA
https://usn.ubuntu.com/4460-1/

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Source: NIST National Vulnerability Database (record CVE-2019-19204), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.