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Vulnerability record · CVE-2017-9228 · published 24 May 2017

CVE-2017-9228: Oniguruma project oniguruma out-of-bounds write 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 heap out-of-bounds write occurs in bitset_set_range() during regular expression compilation due to an uninitialized variable from an incorrect state transition. An incorrect state transition in parse_char_class() could create an execution path that leaves a critical local variable uninitialized until it's used as an index, resulting in an out-of-bounds write memory corruption.

9.8 CVSS 3.1 Critical EPSS 6.3% · top 6.7% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
6.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 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 heap out-of-bounds write occurs in bitset_set_range() during regular expression compilation due to an uninitialized variable from an incorrect state transition. An incorrect state transition in parse_char_class() could create an execution path that leaves a critical local variable uninitialized until it's used as an index, resulting in an out-of-bounds write memory corruption.

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
https://access.redhat.com/errata/RHSA-2018:1296 Third Party Advisory
https://github.com/kkos/oniguruma/commit/3b63d12038c8d8fc278e81c942fa9bec7c704c8b PatchThird Party Advisory
https://github.com/kkos/oniguruma/issues/60 ExploitIssue TrackingThird Party Advisory
https://access.redhat.com/errata/RHSA-2018:1296 Third Party Advisory
https://github.com/kkos/oniguruma/commit/3b63d12038c8d8fc278e81c942fa9bec7c704c8b PatchThird Party Advisory
https://github.com/kkos/oniguruma/issues/60 ExploitIssue TrackingThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-9228), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.