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Vulnerability record · CVE-2017-9224 · published 24 May 2017

CVE-2017-9224: Oniguruma project oniguruma out-of-bounds read vulnerability

OOniguruma Project · Oniguruma

An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in match_at() during regular expression searching. A logical error involving order of validation and access in match_at() could result in an out-of-bounds read from a stack buffer.

9.8 CVSS 3.1 Critical EPSS 6.5% · top 6.4% CWE-125 · Out-of-bounds read
9.8CVSS 3.1 base score, v2 7.5
6.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in match_at() during regular expression searching. A logical error involving order of validation and access in match_at() could result in an out-of-bounds read from a stack buffer.

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

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/101244 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:1296 Third Party Advisory
https://github.com/kkos/oniguruma/commit/690313a061f7a4fa614ec5cc8368b4f2284e059b PatchThird Party Advisory
https://github.com/kkos/oniguruma/issues/57 ExploitIssue TrackingThird Party Advisory
http://www.securityfocus.com/bid/101244 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:1296 Third Party Advisory
https://github.com/kkos/oniguruma/commit/690313a061f7a4fa614ec5cc8368b4f2284e059b PatchThird Party Advisory
https://github.com/kkos/oniguruma/issues/57 ExploitIssue TrackingThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-9224), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.