CVE-2026-47242

MEDIUMPre-NVD 5.85.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (7th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
5.8EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to prohibit CRLF sequences. While Net::IMAP#enable does process its arguments for aliases, it does not validate them as valid atoms (or as a list of valid atoms). The #to_s value is sent verbatim. Arguments to either command could be used by an attacker to inject arbitrary IMAP commands. This vulnerability is fixed in 0.6.5 and 0.5.15.

CVSS v3
5.8
EG Score
5.8MEDIUMmedium confidence
EG Risk
26
EG Risk 26/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity58% × 45%
Impact severity (EG Severity): CVSS 5.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.8): severity, escalated by confirmed exploitation. This CVE's 5.8 is its impact severity (EG Severity), not escalated.

EG Severity
5.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 9, 2026

Last Modified

June 23, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Command Injection via unvalidated ID and ENABLE arguments · Advisory · ruby/net-imap · GitHub

https://github.com/ruby/net-imap/security/advisories/GHSA-46q3-7gv7-qmgg

Vendor Advisories for CVE-2026-47242(14)

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

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatruby:3.3-9060020260805125343.92026-08-12redhat
redhatruby-0:3.3.12-11.el10_0.32026-08-12redhat
redhatruby:3.3-9040020260806064753.92026-08-12redhat
redhatruby:3.3-9080020260728061751.92026-08-05redhat
redhatruby:3.3-8100020260727154509.489197e62026-08-05redhat
redhatruby-0:3.3.12-14.el10_22026-08-05redhat
redhatruby4.0-0:4.0.6-36.el10_22026-08-05redhat
redhatruby:4.0-9080020260727092509.92026-08-05redhat
redhatruby3-3-main-3.3.10-23.4.hum12026-07-15redhat
redhatruby3-4-main-3.4.10-31.hum12026-07-13redhat
redhatruby3-4-main-3.4.8-31.3.hum12026-07-01redhat
redhatruby4-0-main-4.0.0-33.4.hum12026-06-30redhat

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 ... 2.7.5-1 (8 versions)
  • every version on: no fix on record
—
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
net-imap0.1.0 ... 0.5.9 (62 versions)
  • 0.6.0 up to 0.6.4.1: fixed in 0.6.4.1
  • every version up to 0.5.15: fixed in 0.5.15
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 138 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 38 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  3. 2026-10-18 03:36 UTCEG score recompute
  4. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  5. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  6. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  7. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  8. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  9. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  10. 2026-10-12 16:02 UTCEG score recompute
  11. 2026-10-11 19:44 UTCEG score recompute
  12. 2026-10-11 16:59 UTCEG score recompute
  13. 2026-10-11 14:24 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  17. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  22. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  23. 2026-10-03 09:39 UTCOSV refresh
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 7th percentile
Show 75 more
  1. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  3. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  4. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  5. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-09-14 04:22 UTCEG score recompute
  11. 2026-09-14 04:22 UTCVendor advisory
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-08-31 00:27 UTCEG score recompute
  24. 2026-08-31 00:27 UTCVendor advisory
  25. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  27. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  28. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  29. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  30. 2026-08-25 00:46 UTCEG score recompute
  31. 2026-08-23 11:01 UTCEG score recompute
  32. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  34. 2026-08-21 19:41 UTCEG score recompute
  35. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-08-20 17:25 UTCEG score recompute
  37. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  38. 2026-08-19 15:41 UTCEG score recompute
  39. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  40. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-08-17 00:16 UTCEG score recompute
  42. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  44. 2026-08-16 00:14 UTCEG score recompute
  45. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  46. 2026-08-13 22:19 UTCEG score recompute
  47. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  48. 2026-08-12 18:29 UTCEG score recompute
  49. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  50. 2026-08-11 19:22 UTCEG score recompute
  51. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  52. 2026-08-09 16:36 UTCEG score recompute
  53. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  54. 2026-08-08 17:29 UTCEG score recompute
  55. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-08-06 19:13 UTCEG score recompute
  57. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-08-05 20:06 UTCEG score recompute
  59. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-08-04 15:59 UTCEG score recompute
  61. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-03 14:55 UTCEG score recompute
  64. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  65. 2026-08-02 09:05 UTCEG score recompute
  66. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  67. 2026-08-01 09:54 UTCEG score recompute
  68. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  69. 2026-07-31 09:12 UTCEG score recompute
  70. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  71. 2026-07-30 10:04 UTCEG score recompute
  72. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  73. 2026-07-29 05:13 UTCEG score recompute
  74. 2026-07-28 15:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  75. 2026-07-28 02:36 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-47242?
CVE-2026-47242 is a medium-severity vulnerability; its CVE record was published on June 9, 2026. Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to prohibit CRLF…
When was the CVE record for CVE-2026-47242 published?
The CVE record for CVE-2026-47242 was published on June 9, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 23, 2026; the record at its source may have been updated since.
Is CVE-2026-47242 actively exploited?
CVE-2026-47242 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47242?
CVE-2026-47242 has a CVSS base score of 5.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-47242?
A fix for CVE-2026-47242 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-47242 are linked in the Vendor Advisories panel on this page.

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