CVE-2026-47240

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 61% 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
5.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.8Exploit: NoneExposed: 0

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

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.

CVSS v3
5.8
EG Score
5.8(medium)
EPSS
38.6%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 23, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
Patch available. Sources: github.
github Patch Available

Command Injection via non-synchronizing literal in "raw" argument · Advisory · ruby/net-imap · GitHub

https://github.com/ruby/net-imap/security/advisories/GHSA-8p34-64r3-mwg8

Vendor Advisories for CVE-2026-47240(2)

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

Affected Packages

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
net-imap0.1.0 ... 0.5.9 (61 versions)0.5.15—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 37× 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.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-05 22:55 UTCEG score recompute
  4. 2026-07-05 02:30 UTCEPSS rescore
  5. 2026-07-05 00:38 UTCEG score recompute
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-04 01:29 UTCEG score recompute
  8. 2026-07-03 02:50 UTCEG score recompute
  9. 2026-07-02 04:48 UTCEG score recompute
  10. 2026-07-01 15:07 UTCEPSS rescore
  11. 2026-07-01 06:49 UTCEG score recompute
  12. 2026-06-30 23:22 UTCEPSS rescore
  13. 2026-06-30 08:46 UTCEG score recompute
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-29 10:46 UTCEG score recompute
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 12:49 UTCEG score recompute
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-27 14:52 UTCEG score recompute
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-26 16:54 UTCEG score recompute
  24. 2026-06-25 18:58 UTCEG score recompute
  25. 2026-06-25 13:49 UTCEPSS rescore
Show 12 more
  1. 2026-06-24 21:00 UTCEG score recompute
  2. 2026-06-24 14:05 UTCEPSS rescore
  3. 2026-06-23 21:33 UTCEPSS rescore
  4. 2026-06-23 21:33 UTCEPSS rescore
  5. 2026-06-23 19:43 UTCEG score recompute
  6. 2026-06-22 21:40 UTCEG score recompute▲ 5.80
  7. 2026-06-22 21:37 UTCNVD updateCVSS v3 → 5.8 · CVSS v4 → 5.8
  8. 2026-06-16 02:49 UTCEG score recompute
  9. 2026-06-14 23:18 UTCEPSS rescore
  10. 2026-06-13 23:00 UTCEPSS rescore
  11. 2026-06-12 23:12 UTCEPSS rescore
  12. 2026-06-09 19:18 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-47240?
CVE-2026-47240 is a medium vulnerability 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, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing…
When was CVE-2026-47240 disclosed?
CVE-2026-47240 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47240 actively exploited?
CVE-2026-47240 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47240?
CVE-2026-47240 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-47240?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47240, 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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