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Vulnerabilities

Vulnerability · CVE-2026-47242

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby.

Published Jun 22, 2026 · catalog updated Oct 27, 2026 · Net::IMAP implements Internet Message

Last checked Oct 30, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-47242. EPSS is 0.18%. Act only if a listed version of Net::IMAP implements Internet Message is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Net::IMAP implements Internet Message).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Advisory link
Affected products
Alpine:v3.21 ruby-net-imap · Alpine:v3.22 ruby-net-imap · Alpine:v3.23 ruby-net-imap · Alpine:v3.24 ruby-net-imap

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.21 ruby-net-imap0 → 0.4.25-r0
  • Alpine:v3.22 ruby-net-imap0 → 0.5.15-r0
  • Alpine:v3.23 ruby-net-imap0 → 0.5.15-r0
  • Alpine:v3.24 ruby-net-imap0 → 0.5.15-r0

How to fix CVE-2026-47242

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-47242. EPSS is 0.18%. Act only if a listed version of Net::IMAP implements Internet Message is installed.

Which versions are affected?

Compare what you have installed with 0 → 0.4.25-r0, 0 → 0.5.15-r0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 22, 2026 · Trivy Vulnerability DB

    Detected

    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 val

  2. Oct 27, 2026 · Trivy Vulnerability DB

    Fix available

    ruby-net-imap fixed in 0.4.25-r0; ruby-net-imap fixed in 0.5.15-r0; ruby-net-imap fixed in 0.5.15-r0; ruby-net-imap fixed in 0.5.15-r0

  3. Oct 27, 2026 · Trivy Vulnerability DB

    Fix available

    ruby-net-imap fixed in 0.4.25-r0

  4. Oct 27, 2026 · Trivy Vulnerability DB

    Fix available

    ruby-net-imap fixed in 0.5.15-r0

  5. Oct 27, 2026 · Trivy Vulnerability DB

    Updated

    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 val

Sources

  • CVE.orgVulnerability recordCVE-2026-47242

    Official CVE identifier

    cve.org
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-47242
    osv.dev
  • Trivy Vulnerability DBPackage advisoryALPINE-CVE-2026-47242

    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

    osv.dev

References

Freshness

Last verified in this catalog Oct 30, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Trivy Vulnerability DBOct 29, 2026
  • OpenSSF OSV / OSV ScannerOct 28, 2026
  • CVE.orgOct 27, 2026