DEBIAN-CVE-2026-26962
Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.
DEBIAN-CVE-2026-26962
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-2026-26962
ruby-rack
Source reference: /affected/0/package/name
- Affected versions
- 3.1.16-0.1
Source reference:
/affected/0/versions3.1.18-1Source reference:
/affected/0/versions3.1.18-1~deb13u1Source reference:
/affected/0/versions3.1.20-0+deb13u1Source reference:
/affected/0/versions - Fixed versions
- 3.1.20-0+deb13u2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
ruby-rack
Source reference: /affected/1/package/name
- Affected versions
- 3.1.16-0.1
Source reference:
/affected/1/versions3.1.18-1Source reference:
/affected/1/versions3.1.18-1~deb13u1Source reference:
/affected/1/versions3.2.4-1Source reference:
/affected/1/versions3.2.5-1Source reference:
/affected/1/versions3.2.5-2Source reference:
/affected/1/versions3.2.6-1Source reference:
/affected/1/versions - Fixed versions
- 3.2.6-2
Source reference:
/affected/1/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"
},
{
"fixed": "3.1.20-0+deb13u2"
}
]
}
],
"package": {
"name": "ruby-rack",
"purl": "pkg:deb/debian/ruby-rack?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.1.16-0.1",
"3.1.18-1",
"3.1.18-1~deb13u1",
"3.1.20-0+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26962.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.2.6-2"
}
]
}
],
"package": {
"name": "ruby-rack",
"purl": "pkg:deb/debian/ruby-rack?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.1.16-0.1",
"3.1.18-1",
"3.1.18-1~deb13u1",
"3.2.4-1",
"3.2.5-1",
"3.2.5-2",
"3.2.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26962.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56259 · Revision 1
- Added to Heist Feed
- Publisher date