CVE-2026-41316

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 85% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.1Exploit: NoneExposed: 0

A fix is available — apply it.

ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an @_init instance variable guard in ERB#result and ERB#run to prevent code execution when an ERB object is reconstructed via Marshal.load (deserialization). However, three other public methods that also evaluate @src via eval() were not given the same guard: ERB#def_method, ERB#def_module, and ERB#def_class. An attacker who can trigger Marshal.load on untrusted data in a Ruby application that has erb loaded can use ERB#def_module (zero-arg, default parameters) as a code execution sink, bypassing the @_init protection entirely. ERB 4.0.3.1, 4.0.4.1, 6.0.1.1, and 6.0.4 patch the issue.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
62.6%
KEV
Not listed

Published

April 24, 2026

Last Modified

July 10, 2026

Advisory Details (1)

Auto-updated Apr 29, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

ERB @_init deserialization guard bypass via def_module / def_method / def_class · Advisory · ruby/erb · GitHub

https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv

Vendor Advisories for CVE-2026-41316(14)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatruby4.0-0:4.0.3-34.el10_22026-05-26redhat
redhatruby:3.3-8100020260428163940.489197e62026-05-26redhat
redhatruby:4.0-9080020260513131334.92026-05-26redhat
redhatruby-0:3.0.4-160.2.el9_02026-05-26redhat
redhatruby-0:3.0.7-166.el9_72026-05-18redhat
redhatruby-0:3.3.10-12.el10_12026-05-18redhat
redhatruby:3.3-9070020260428163621.92026-05-18redhat

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

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
erb6.0.2, 6.0.36.0.4—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 38× 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 122 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-41316?
CVE-2026-41316 is a high vulnerability published on April 24, 2026. ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an @init instance variable guard in ERB#result and ERB#run to prevent code execution when an ERB object is reconstructed via Marshal.load (deserialization). However, three other public…
When was CVE-2026-41316 disclosed?
CVE-2026-41316 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41316 actively exploited?
CVE-2026-41316 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 62.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41316?
CVE-2026-41316 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-41316?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41316, 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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