CVE-2017-9227

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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 9.8Exploit: None knownExposed: 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 stack out-of-bounds read occurs in mbc_enc_len() during regular expression searching. Invalid handling of reg->dmin in forward_search_range() could result in an invalid pointer dereference, as an out-of-bounds read from a stack buffer.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

May 24, 2017

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Aug 24, 2026
Patch available. Sources: redhat, github_commit.
generic

Bug in mbc_enc_len · Issue #58 · kkos/oniguruma · GitHub

https://github.com/kkos/oniguruma/issues/58
github_commit Patch Available

commit 9690d3ab1f9b (kkos/oniguruma)

Patch available: kkos/oniguruma v6.7.1 (contains commit 9690d3ab1f9b)

https://github.com/kkos/oniguruma/commit/9690d3ab1f9bcd2db8cbe1fe3ee4a5da606b8814
redhat Patch Available
https://access.redhat.com/errata/RHSA-2018:1296
generic

CVE-2017-9227 - PSIRT.COM

http://www.securityfocus.com/bid/100538

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp7.0-fpm (7.0.22-0ubuntu0.17.04.1) @ zesty2026-05-20ubuntu
ubuntuphp5-cgi (5.3.10-1ubuntu3.28) @ precise2026-05-20ubuntu
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.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.4(1)
PackageVulnerable rangeFixed inDependents
php5—5.6.31-r0—
Alpine:v3.5(1)
PackageVulnerable rangeFixed inDependents
php5—5.6.31-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libonig—6.1.3-2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libonig—6.1.3-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libonig—6.1.3-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libonig—6.1.3-2—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
libonig5.9.1-15.9.1-1+deb7u1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

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 6× in last 7d / 24× 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 168 total refreshes for this CVE.

  1. 2026-08-27 14:21 UTCEPSS rescore
  2. 2026-08-26 23:39 UTCOSV refresh
  3. 2026-08-26 14:41 UTCEPSS rescore
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  1. 2026-07-25 14:11 UTCOSV refresh
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  3. 2026-07-23 01:31 UTCEG score recompute
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  26. 2026-07-08 08:57 UTCOSV refresh
  27. 2026-07-07 13:42 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2017-9227?
CVE-2017-9227 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 stack out-of-bounds read occurs in mbcenclen() during regular expression searching. Invalid handling of reg->dmin in forwardsearchrange() could result in an invalid…
When was CVE-2017-9227 disclosed?
CVE-2017-9227 was first published in the National Vulnerability Database on May 24, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-9227 actively exploited?
CVE-2017-9227 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.0% of all scored CVEs.
What is the CVSS score of CVE-2017-9227?
CVE-2017-9227 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-9227?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-9227, 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.

Dependency Blast Radius

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