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% (8th 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

Also known asEUVD-2026-38353 (ENISA EUVD) · GHSA-46q3-7gv7-qmgg (GitHub Security Advisories)Source: ENISA EUVD

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
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
8th
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
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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, and whom BOD 26-04 binds: 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.

The score's inputs: 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

October 25, 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

Patch Availability(14)

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-0.3.1-31.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
rubygemsnet-imap @ 0.6.4.1 (fixes >= 0.6.0, <= 0.6.4)—ghsa
rubygemsnet-imap @ 0.5.15 (fixes <= 0.5.14)—ghsa

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

(9 across 9 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-net-imap—
  • every version up to 0.4.25-r0: fixed in 0.4.25-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-net-imap—
  • every version up to 0.5.15-r0: fixed in 0.5.15-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-net-imap—
  • every version up to 0.5.15-r0: fixed in 0.5.15-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-net-imap—
  • every version up to 0.5.15-r0: fixed in 0.5.15-r0
—
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 up to 3.3.13-0+deb13u1: fixed in 3.3.13-0+deb13u1
—
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 7× in last 7d / 34× 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 its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 172 rows 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 72 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:52 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  3. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  4. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  5. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  6. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  7. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  8. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  9. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  10. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  11. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  12. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  13. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  14. 2026-11-01 07:47 UTCGHSA enrichmentGHSA-46q3-7gv7-qmgg · GitHub severity MODERATE
  15. 2026-11-01 07:47 UTCEchelonGraph re-scored
  16. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  17. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  18. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-10-29 16:20 UTCEchelonGraph re-scored
  20. 2026-10-29 16:20 UTCVendor advisory
  21. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  22. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  23. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  24. 2026-10-25 23:35 UTCEchelonGraph re-scored
  25. 2026-10-25 23:35 UTCVendor advisory
Show 75 more
  1. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-10-25 14:24 UTCEchelonGraph re-scored
  3. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  4. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  5. 2026-10-22 23:17 UTCEchelonGraph re-scored
  6. 2026-10-22 23:17 UTCVendor advisory
  7. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  8. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  9. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  10. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  11. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  12. 2026-10-18 03:36 UTCEchelonGraph re-scored
  13. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  14. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  15. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  16. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  17. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  18. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-10-12 16:02 UTCEchelonGraph re-scored
  20. 2026-10-11 19:44 UTCEchelonGraph re-scored
  21. 2026-10-11 16:59 UTCEchelonGraph re-scored
  22. 2026-10-11 14:24 UTCEchelonGraph re-scored
  23. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  24. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  25. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  26. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  27. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  28. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  29. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  30. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  31. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  32. 2026-10-03 09:39 UTCOSV refresh
  33. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  34. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  35. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  36. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  37. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  38. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  39. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  40. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  42. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  44. 2026-09-14 04:22 UTCEchelonGraph re-scored
  45. 2026-09-14 04:22 UTCVendor advisory
  46. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  47. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  48. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  49. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  50. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  51. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  52. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  54. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  55. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  57. 2026-08-31 00:27 UTCEchelonGraph re-scored
  58. 2026-08-31 00:27 UTCVendor advisory
  59. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  61. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  64. 2026-08-25 00:46 UTCEchelonGraph re-scored
  65. 2026-08-23 11:01 UTCEchelonGraph re-scored
  66. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  67. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-08-21 19:41 UTCEchelonGraph re-scored
  69. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  70. 2026-08-20 17:25 UTCEchelonGraph re-scored
  71. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  72. 2026-08-19 15:41 UTCEchelonGraph re-scored
  73. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  74. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  75. 2026-08-17 00:16 UTCEchelonGraph re-scored

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 October 25, 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 (8th 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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