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Vulnerability record · CVE-2017-9229 · published 24 May 2017

CVE-2017-9229: Oniguruma project oniguruma null pointer dereference 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 SIGSEGV occurs in left_adjust_char_head() during regular expression compilation. Invalid handling of reg->dmax in forward_search_range() could result in an invalid pointer dereference, normally as an immediate denial-of-service condition.

7.5 CVSS 3.1 High EPSS 5.1% · top 7.9% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
5.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected 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 SIGSEGV occurs in left_adjust_char_head() during regular expression compilation. Invalid handling of reg->dmax in forward_search_range() could result in an invalid pointer dereference, normally as an immediate denial-of-service condition.

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://access.redhat.com/errata/RHSA-2018:1296 Third Party Advisory
https://github.com/kkos/oniguruma/commit/b690371bbf97794b4a1d3f295d4fb9a8b05d402d PatchThird Party Advisory
https://github.com/kkos/oniguruma/issues/59 ExploitThird Party Advisory
https://access.redhat.com/errata/RHSA-2018:1296 Third Party Advisory
https://github.com/kkos/oniguruma/commit/b690371bbf97794b4a1d3f295d4fb9a8b05d402d PatchThird Party Advisory
https://github.com/kkos/oniguruma/issues/59 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-9229), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.