CVE-2017-9228

Name: CVE-2017-9228
Creator: NVD / NIST
Published: 2017-05-24T15:29:00.37+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 6.26%

Last modified Jun 17, 2026

CVE-2017-9228 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 6.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

6.26%

92.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Oniguruma Project	Oniguruma	6.2.0
Php	Php	>= 5.6.0, < 5.6.31
Php	Php	>= 7.0.0, < 7.0.21
Php	Php	>= 7.1.0, < 7.1.7

References

https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
https://github.com/kkos/oniguruma/commit/3b63d12038c8d8fc278e81c942fa9bec7c704c8bPatch, Third Party Advisory
https://github.com/kkos/oniguruma/issues/60Exploit, Issue Tracking, Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
https://github.com/kkos/oniguruma/commit/3b63d12038c8d8fc278e81c942fa9bec7c704c8bPatch, Third Party Advisory
https://github.com/kkos/oniguruma/issues/60Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: May 24, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-9228?

How severe is CVE-2017-9228?

CVE-2017-9228 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 6.26% probability of exploitation in the next 30 days.

How do I fix CVE-2017-9228?

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-2017-9228?

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

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Source: NVD / NIST