CVE-2017-9225

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. 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: 3.1%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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 write in onigenc_unicode_get_case_fold_codes_by_str() occurs during regular expression compilation. Code point 0xFFFFFFFF is not properly handled in unicode_unfold_key(). A malformed regular expression could result in 4 bytes being written off the end of a stack buffer of expand_case_fold_string() during the call to onigenc_unicode_get_case_fold_codes_by_str(), a typical stack buffer overflow.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

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%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
3.1%
EPSS %ILE
87th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 24, 2017

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Oct 5, 2026
Patch available. Sources: github_commit.
generic

Buffer Overflow in onigenc_unicode_get_case_fold_codes_by_str() · Issue #56 · kkos/oniguruma · GitHub

https://github.com/kkos/oniguruma/issues/56
github_commit Patch Available

commit 166a6c3999bf (kkos/oniguruma)

Patch available: kkos/oniguruma v6.7.1 (contains commit 166a6c3999bf)

https://github.com/kkos/oniguruma/commit/166a6c3999bf06b4de0ab4ce6b088a468cc4029f

Vendor Advisories for CVE-2017-9225(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatoniguruma-main-6.9.10-4.1.hum12026-04-10redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libonig—
  • every version up to 6.1.3-2: fixed in 6.1.3-2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libonig—
  • every version up to 6.1.3-2: fixed in 6.1.3-2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libonig—
  • every version up to 6.1.3-2: fixed in 6.1.3-2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libonig—
  • every version up to 6.1.3-2: fixed in 6.1.3-2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 27× 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 207 total refreshes for this CVE.

  1. 2026-10-10 19:55 UTCEPSS rescore
  2. 2026-10-09 20:02 UTCEPSS rescore
  3. 2026-10-08 16:36 UTCEPSS rescore
  4. 2026-10-07 23:41 UTCEPSS rescore
  5. 2026-10-06 15:12 UTCEPSS rescore
  6. 2026-10-05 17:39 UTCEPSS rescore
  7. 2026-10-04 10:08 UTCOSV refresh
  8. 2026-10-03 14:21 UTCEPSS rescore
  9. 2026-10-03 14:21 UTCEPSS rescore
  10. 2026-09-30 14:59 UTCEPSS rescore
  11. 2026-09-30 09:49 UTCEG score recompute
  12. 2026-09-28 13:45 UTCEPSS rescore
  13. 2026-09-27 13:40 UTCEPSS rescore
  14. 2026-09-27 13:40 UTCEPSS rescore
  15. 2026-09-26 15:53 UTCEPSS rescore
  16. 2026-09-26 00:19 UTCEPSS rescore
  17. 2026-09-24 13:59 UTCEPSS rescore
  18. 2026-09-23 13:42 UTCEPSS rescore
  19. 2026-09-21 20:27 UTCEPSS rescore
  20. 2026-09-20 20:09 UTCEPSS rescore
  21. 2026-09-19 15:36 UTCEPSS rescore
  22. 2026-09-17 19:22 UTCEPSS rescore
  23. 2026-09-17 19:22 UTCEPSS rescore
  24. 2026-09-15 03:05 UTCEPSS rescore
  25. 2026-09-15 00:14 UTCOSV refresh
Show 75 more
  1. 2026-09-12 14:56 UTCEPSS rescore
  2. 2026-09-11 09:31 UTCEPSS rescore
  3. 2026-09-07 15:56 UTCEPSS rescore
  4. 2026-09-05 15:24 UTCEPSS rescore
  5. 2026-09-04 13:56 UTCEPSS rescore
  6. 2026-09-04 05:02 UTCEPSS rescore
  7. 2026-09-02 14:07 UTCEPSS rescore
  8. 2026-09-02 14:07 UTCEPSS rescore
  9. 2026-09-01 03:31 UTCEPSS rescore
  10. 2026-08-30 19:13 UTCEPSS rescore
  11. 2026-08-28 21:36 UTCEPSS rescore
  12. 2026-08-27 14:21 UTCEPSS rescore
  13. 2026-08-26 23:39 UTCOSV refresh
  14. 2026-08-26 14:41 UTCEPSS rescore
  15. 2026-08-25 13:44 UTCEPSS rescore
  16. 2026-08-23 00:14 UTCEPSS rescore
  17. 2026-08-21 23:44 UTCEPSS rescore
  18. 2026-08-19 16:59 UTCEPSS rescore
  19. 2026-08-18 13:43 UTCEPSS rescore
  20. 2026-08-16 14:51 UTCEPSS rescore
  21. 2026-08-16 02:10 UTCEPSS rescore
  22. 2026-08-15 01:26 UTCEPSS rescore
  23. 2026-08-12 13:46 UTCEPSS rescore
  24. 2026-08-10 13:40 UTCOSV refresh
  25. 2026-08-08 16:32 UTCEPSS rescore
  26. 2026-08-07 16:22 UTCEPSS rescore
  27. 2026-08-06 13:42 UTCEPSS rescore
  28. 2026-08-06 13:42 UTCEPSS rescore
  29. 2026-08-05 19:13 UTCEPSS rescore
  30. 2026-08-02 02:23 UTCEPSS rescore
  31. 2026-08-02 02:23 UTCEPSS rescore
  32. 2026-08-01 04:12 UTCEPSS rescore
  33. 2026-07-30 16:24 UTCEPSS rescore
  34. 2026-07-30 01:26 UTCEPSS rescore
  35. 2026-07-28 15:32 UTCEPSS rescore
  36. 2026-07-26 14:51 UTCEPSS rescore
  37. 2026-07-26 14:51 UTCEPSS rescore
  38. 2026-07-25 14:30 UTCOSV refresh
  39. 2026-07-23 14:15 UTCEPSS rescore
  40. 2026-07-23 01:31 UTCEG score recompute
  41. 2026-07-22 22:11 UTCEG score recompute
  42. 2026-07-22 14:04 UTCEPSS rescore
  43. 2026-07-21 15:21 UTCEPSS rescore
  44. 2026-07-20 17:04 UTCEPSS rescore
  45. 2026-07-20 17:04 UTCEPSS rescore
  46. 2026-07-19 14:28 UTCEPSS rescore
  47. 2026-07-19 14:28 UTCEPSS rescore
  48. 2026-07-19 02:26 UTCEPSS rescore
  49. 2026-07-19 02:26 UTCEPSS rescore
  50. 2026-07-18 10:01 UTCEPSS rescore
  51. 2026-07-16 16:59 UTCEPSS rescore
  52. 2026-07-16 16:59 UTCEPSS rescore
  53. 2026-07-15 16:55 UTCEPSS rescore
  54. 2026-07-15 16:54 UTCEPSS rescore
  55. 2026-07-15 01:56 UTCEPSS rescore
  56. 2026-07-15 01:56 UTCEPSS rescore
  57. 2026-07-13 22:26 UTCEPSS rescore
  58. 2026-07-13 22:26 UTCEPSS rescore
  59. 2026-07-12 05:43 UTCEPSS rescore
  60. 2026-07-11 08:24 UTCEPSS rescore
  61. 2026-07-09 19:06 UTCEPSS rescore
  62. 2026-07-08 15:11 UTCEPSS rescore
  63. 2026-07-08 09:27 UTCOSV refresh
  64. 2026-07-07 13:42 UTCEPSS rescore
  65. 2026-07-06 16:24 UTCEPSS rescore
  66. 2026-07-06 16:24 UTCEPSS rescore
  67. 2026-07-06 02:20 UTCEPSS rescore
  68. 2026-07-06 02:20 UTCEPSS rescore
  69. 2026-07-05 02:27 UTCEPSS rescore
  70. 2026-07-04 06:28 UTCEPSS rescore
  71. 2026-07-04 06:28 UTCEPSS rescore
  72. 2026-07-02 16:54 UTCEPSS rescore
  73. 2026-07-01 15:03 UTCEPSS rescore
  74. 2026-06-30 23:19 UTCEPSS rescore
  75. 2026-06-30 23:19 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2026:7545

Frequently asked(5)

What is CVE-2017-9225?
CVE-2017-9225 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 write in onigencunicodegetcasefoldcodesbystr() occurs during regular expression compilation. Code point 0xFFFFFFFF is not properly handled in…
When was CVE-2017-9225 disclosed?
CVE-2017-9225 was first published 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-2017-9225 actively exploited?
CVE-2017-9225 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.1% probability of exploitation in the next 30 days (87th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-9225?
CVE-2017-9225 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-9225?
A fix for CVE-2017-9225 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2017-9225 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2017-9225

Explore →

Is Your Infrastructure Affected by CVE-2017-9225?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs