DEBIAN-CVE-2026-63435
Mail is an internet library for Ruby designed to handle email generation, parsing, and sending. Prior to 2.9.1, Mail::Utilities.q_value_decode and Mail::Utilities.b_value_decode used a single String#match and an overly greedy charset capture to decode only the first RFC 2047 encoded-word and mishandle surrounding or subsequent text. A crafted malformed encoded-word in an address display name or local part could cross ? delimiters and make decoded From, To, or Reply-To header values differ from the raw values inspected by a human reviewer or downstream parser, enabling apparent sender or recipient spoofing, phishing, or authorization-check bypass. This issue is fixed in version 2.9.1.
DEBIAN-CVE-2026-63435
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-63435
ruby-mail
Source reference: /affected/0/package/name
- Affected versions
- 2.7.1+dfsg1-2
Source reference:
/affected/0/versions2.8.1+dfsg1-1Source reference:
/affected/0/versions2.8.1+dfsg1-2Source reference:
/affected/0/versions2.9.0+dfsg1-1Source reference:
/affected/0/versions2.9.1-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
ruby-mail
Source reference: /affected/1/package/name
- Affected versions
- 2.8.1+dfsg1-2
Source reference:
/affected/1/versions2.9.0+dfsg1-1Source reference:
/affected/1/versions2.9.1-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
ruby-mail
Source reference: /affected/2/package/name
- Affected versions
- 2.8.1+dfsg1-2
Source reference:
/affected/2/versions2.9.0+dfsg1-1Source reference:
/affected/2/versions - Fixed versions
- 2.9.1-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-mail",
"purl": "pkg:deb/debian/ruby-mail?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.7.1+dfsg1-2",
"2.8.1+dfsg1-1",
"2.8.1+dfsg1-2",
"2.9.0+dfsg1-1",
"2.9.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63435.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ruby-mail",
"purl": "pkg:deb/debian/ruby-mail?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.8.1+dfsg1-2",
"2.9.0+dfsg1-1",
"2.9.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63435.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.1-1"
}
]
}
],
"package": {
"name": "ruby-mail",
"purl": "pkg:deb/debian/ruby-mail?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.8.1+dfsg1-2",
"2.9.0+dfsg1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63435.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58127 · Revision 1
- Added to Heist Feed
- Publisher date