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CVE-2026-42257

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a3e08d4fca97e5cec4d3546c8b74523d657d45cafb10e77ad9baa3e602af5462
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-77","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"net-imap","vendor":"ruby","versions":[{"status":"affected","version":"< 0.4.24"},{"status":"affected","version":">= 0.5.0, < 0.5.14"},{"status":"affected","version":">= 0.6.0, < 0.6.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":5.8,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-77","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/ruby/net-imap/releases/tag/v0.4.24","tags":["x_refsource_MISC"],"url":"https://github.com/ruby/net-imap/releases/tag/v0.4.24"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/references/1
{"name":"https://github.com/ruby/net-imap/releases/tag/v0.5.14","tags":["x_refsource_MISC"],"url":"https://github.com/ruby/net-imap/releases/tag/v0.5.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/references/2
{"name":"https://github.com/ruby/net-imap/releases/tag/v0.6.4","tags":["x_refsource_MISC"],"url":"https://github.com/ruby/net-imap/releases/tag/v0.6.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/references/3
{"name":"https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e7a439e92b57ba8af2b917606ca674b7f83612a983026363b3c53240fdd72870 · sha256:da6a241ab0ee6fbb… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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