CVE-2017-9226

Name: CVE-2017-9226
Creator: NVD / NIST
Published: 2017-05-24T15:29:00.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 7.51%

Last modified Jun 17, 2026

CVE-2017-9226 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 or read occurs in next_state_val() during regular expression compilation. EPSS estimates a 7.51% 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 or read occurs in next_state_val() during regular expression compilation. Octal numbers larger than 0xff are not handled correctly in fetch_token() and fetch_token_in_cc(). A malformed regular expression containing an octal number in the form of '\700' would produce an invalid code point value larger than 0xff in next_state_val(), 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

7.51%

93.7th 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	< 5.6.31
Php	Php	>= 7.0.0, < 7.0.21
Php	Php	>= 7.1.0, < 7.1.7

References

http://www.securityfocus.com/bid/101244Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
https://github.com/kkos/oniguruma/commit/b4bf968ad52afe14e60a2dc8a95d3555c543353aPatch, Third Party Advisory
https://github.com/kkos/oniguruma/commit/f015fbdd95f76438cd86366467bb2b39870dd7c6Patch, Third Party Advisory
https://github.com/kkos/oniguruma/issues/55Exploit, Issue Tracking, Third Party Advisory
http://www.securityfocus.com/bid/101244Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
https://github.com/kkos/oniguruma/commit/b4bf968ad52afe14e60a2dc8a95d3555c543353aPatch, Third Party Advisory
https://github.com/kkos/oniguruma/commit/f015fbdd95f76438cd86366467bb2b39870dd7c6Patch, Third Party Advisory
https://github.com/kkos/oniguruma/issues/55Exploit, Issue Tracking, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2017-9226?

How severe is CVE-2017-9226?

CVE-2017-9226 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 7.51% probability of exploitation in the next 30 days.

How do I fix CVE-2017-9226?

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-2017-9226?

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

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Source: NVD / NIST