CVE-2009-3086

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:N/A:N. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 2.2% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Trending — 3 sources updated this week
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS v2: 5.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A certain algorithm in Ruby on Rails 2.1.0 through 2.2.2, and 2.3.x before 2.3.4, leaks information about the complexity of message-digest signature verification in the cookie store, which might allow remote attackers to forge a digest via multiple attempts.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity50% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
81%
KEV
Not listed

Published

September 8, 2009

Last Modified

April 23, 2026

References (12)

Affected Packages

(2 across 1 ecosystem)
RubyGems(2)
PackageVulnerable rangeFixed inDependents
actionpack2.3.2, 2.3.32.3.4—
activesupport2.3.2, 2.3.32.3.4—

Data Freshness Timeline

(refreshed 13× 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 102 total refreshes for this CVE.

  1. 2026-07-26 13:38 UTCEG score recompute▲ 5.00
  2. 2026-07-25 14:12 UTCEPSS rescore
  3. 2026-07-24 21:11 UTCOSV refresh
  4. 2026-07-24 14:12 UTCEPSS rescore
  5. 2026-07-23 14:14 UTCEPSS rescore
  6. 2026-07-23 00:59 UTCEG score recompute
  7. 2026-07-23 00:37 UTCEG score recompute
  8. 2026-07-23 00:04 UTCEG score recompute
  9. 2026-07-22 21:43 UTCEG score recompute
  10. 2026-07-22 14:03 UTCEPSS rescore
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  25. 2026-07-07 16:12 UTCOSV refresh
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  1. 2026-07-06 16:23 UTCEPSS rescore
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  24. 2026-06-19 19:22 UTCEPSS rescore
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  26. 2026-06-19 03:44 UTCOSV refresh
  27. 2026-06-18 17:49 UTCEPSS rescore
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  59. 2026-05-31 00:13 UTCEPSS rescore
  60. 2026-05-30 15:26 UTCEG score recompute
  61. 2026-05-29 13:40 UTCEPSS rescore
  62. 2026-05-29 10:06 UTCOSV refresh
  63. 2026-05-28 13:42 UTCEPSS rescore
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  75. 2026-05-20 22:37 UTCEPSS rescore

Frequently asked(4)

What is CVE-2009-3086?
CVE-2009-3086 is a medium vulnerability published on September 8, 2009. A certain algorithm in Ruby on Rails 2.1.0 through 2.2.2, and 2.3.x before 2.3.4, leaks information about the complexity of message-digest signature verification in the cookie store, which might allow remote attackers to forge a digest via multiple attempts.
When was CVE-2009-3086 disclosed?
CVE-2009-3086 was first published in the National Vulnerability Database on September 8, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-3086 actively exploited?
CVE-2009-3086 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 19.1% of all scored CVEs.
How do I remediate CVE-2009-3086?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3086, 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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