ruby3.1, ruby3.3 — security advisory
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.
- Products
- ruby3.1, ruby3.3
- Affected versions
- 3.1.2-7, 3.1.2-7+deb12u1, 3.1.2-7+hurd.1, 3.1.2-8, 3.1.2-8.1~exp1, 3.1.2-8.3, 3.1.2-8.4, 3.1.2-8.5, 3.3.8-2, 3.3.8-2.1, 3.3.8-2.2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-47242
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:20 UTC · Revision 2
Source evidence
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.
osv:DEBIAN-CVE-2026-47242
ruby3.1
Fixed versions: Not specified
ruby3.3
Fixed versions: Not specified
ruby3.3
Fixed versions: Not specified
Complete source record
{
"id": "e07111cf9e01b5a03ac3759b01a06f8c4ee4e22f09da4265dd8e1349c5da2655",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-47242",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-47242",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2026-47242",
"products": [
{
"name": {
"value": "ruby3.1",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.2-7",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2-7+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2-7+hurd.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2-8",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2-8.1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2-8.3",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2-8.4",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2-8.5",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "ruby3.3",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.3.8-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.3.8-2.1",
"evidence": "/affected/1/versions"
},
{
"value": "3.3.8-2.2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "ruby3.3",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.3.8-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.3.8-2.1",
"evidence": "/affected/2/versions"
},
{
"value": "3.3.8-2.2",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-47242",
"aliases": [
"DEBIAN-CVE-2026-47242"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby3.1",
"purl": "pkg:deb/debian/ruby3.1?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.1.2-7",
"3.1.2-7+deb12u1",
"3.1.2-7+hurd.1",
"3.1.2-8",
"3.1.2-8.1~exp1",
"3.1.2-8.3",
"3.1.2-8.4",
"3.1.2-8.5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47242.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby3.3",
"purl": "pkg:deb/debian/ruby3.3?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.3.8-2",
"3.3.8-2.1",
"3.3.8-2.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47242.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby3.3",
"purl": "pkg:deb/debian/ruby3.3?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.3.8-2",
"3.3.8-2.1",
"3.3.8-2.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47242.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T11:47:38.313914917Z",
"provider": "osv",
"upstream": [
"CVE-2026-47242"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-47242"
]
},
"related_cves": [
{
"value": "CVE-2026-47242",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450888,
"published_at": "2026-06-22T21:16:24.807+00:00"
}