CVE-2017-9226

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 8%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
93.8%
KEV
Not listed

Published

May 24, 2017

Last Modified

May 13, 2026

Advisory Details (5)

Auto-updated May 17, 2026
Patch available. Sources: redhat.
generic

Heap corruption in next_state_val() in 15 encodings · Issue #55 · kkos/oniguruma · GitHub

https://github.com/kkos/oniguruma/issues/55
generic

fix #55 : Byte value expressed in octal must be smaller than 256 · kkos/oniguruma@f015fbd · GitHub

https://github.com/kkos/oniguruma/commit/f015fbdd95f76438cd86366467bb2b39870dd7c6
generic

fix #55 : check too big code point value for single byte value in nex… · kkos/oniguruma@b4bf968 · GitHub

https://github.com/kkos/oniguruma/commit/b4bf968ad52afe14e60a2dc8a95d3555c543353a
redhat Patch Available
https://access.redhat.com/errata/RHSA-2018:1296
generic
http://www.securityfocus.com/bid/101244

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp5-cgi (5.3.10-1ubuntu3.28) @ precise2026-05-20ubuntu
ubuntuphp7.0-fpm (7.0.22-0ubuntu0.17.04.1) @ zesty2026-05-20ubuntu
redhatrh-php70-php-0:7.0.27-1.el72018-05-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 123 total refreshes for this CVE.

  1. 2026-07-07 13:42 UTCEPSS rescore
  2. 2026-07-06 16:24 UTCEPSS rescore
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  1. 2026-06-21 01:57 UTCEPSS rescore
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  4. 2026-06-19 13:55 UTCOSV refresh
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  37. 2026-05-30 21:23 UTCOSV refresh
  38. 2026-05-29 13:41 UTCEPSS rescore
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  70. 2026-05-20 08:33 UTCEG score recompute
  71. 2026-05-20 08:33 UTCVendor advisory
  72. 2026-05-20 08:33 UTCGHSA enrichment
  73. 2026-05-20 04:27 UTCEG score recompute
  74. 2026-05-20 04:27 UTCVendor advisory
  75. 2026-05-20 04:27 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2017-9226?
CVE-2017-9226 is a critical vulnerability published on May 24, 2017. 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 nextstateval() during regular expression compilation. Octal numbers larger than 0xff are not handled correctly in fetchtoken()…
When was CVE-2017-9226 disclosed?
CVE-2017-9226 was first published in the National Vulnerability Database on May 24, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-9226 actively exploited?
CVE-2017-9226 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-9226?
CVE-2017-9226 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-9226?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-9226, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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