CVE-2026-41316

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.1%, top 37% 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, secondary
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.3%CVSS: 8.1Exploit: None knownExposed services: Not assessed

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
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
EPSS PROB
1.3%
EPSS %ILE
69th
KEV
Not listed

Published

April 24, 2026

Last Modified

August 24, 2026

Advisory Details (1)

Auto-updated Apr 29, 2026
🔬 Proof of concept available. Patch available. Sources: github.
githubMentions a patch (unverified)🟡 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(13)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatruby:3.3-9060020260630075016.92026-07-09redhat
redhatruby-0:3.0.4-161.el9_2.32026-07-06redhat
redhatruby-0:3.0.7-165.el9_6.12026-06-30redhat
redhatruby-0:3.3.10-11.el10_0.12026-06-30redhat
redhatruby:3.3-9040020260520083544.92026-06-17redhat
redhatruby-0:3.0.7-162.el9_4.22026-06-16redhat
redhatruby-0:3.0.4-160.2.el9_02026-05-26redhat
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-0:3.3.10-12.el10_12026-05-18redhat
redhatruby-0:3.0.7-166.el9_72026-05-18redhat
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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
ruby2.72.7.4-1 ... 2.7.4-1+deb11u5 (6 versions)
  • every version up to 2.7.4-1+deb11u6: fixed in 2.7.4-1+deb11u6
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ruby3.13.1.2-7 ... 3.1.2-8.5 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ruby3.33.3.8-2, 3.3.8-2.1, 3.3.8-2.2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ruby3.33.3.8-2, 3.3.8-2.1, 3.3.8-2.2
  • every version on: no fix on record
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
erb6.0.2, 6.0.3
  • every version up to 4.0.3.1: fixed in 4.0.3.1
  • 4.0.4 up to 4.0.4.1: fixed in 4.0.4.1
  • 5.0.0 up to 6.0.1.1: fixed in 6.0.1.1
  • 6.0.2 up to 6.0.4: fixed in 6.0.4
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 23× 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 222 total refreshes for this CVE.

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

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redhat:RHSA-2026:33462 · redhat:RHSA-2026:20596 · redhat:RHSA-2026:37238

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 on April 24, 2026, with the most recent update on August 24, 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 1.3% probability of exploitation in the next 30 days (69th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41316?
CVE-2026-41316 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-41316?
A fix for CVE-2026-41316 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-41316 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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