DEBIAN-CVE-2026-34582
Botan is a C++ cryptography library. Prior to version 3.11.1, the TLS 1.3 implementation allowed ApplicationData records to be processed prior to the Finished message being received. A server which is attempting to enforce client authentication via certificates can by bypassed by a client which entirely omits Certificate, CertificateVerify, and the Finished message and instead sends application data records. This vulnerability is fixed in 3.11.1.
DEBIAN-CVE-2026-34582
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-2026-34582
botan3
Source reference: /affected/0/package/name
- Affected versions
- 3.10.0+dfsg-1
Source reference:
/affected/0/versions3.10.0+dfsg-2Source reference:
/affected/0/versions3.11.0+dfsg-1Source reference:
/affected/0/versions3.7.1+dfsg-2Source reference:
/affected/0/versions3.8.1+dfsg-1Source reference:
/affected/0/versions3.9.0+dfsg-1Source reference:
/affected/0/versions3.9.0+dfsg-2Source reference:
/affected/0/versions3.9.0+dfsg-2.1Source reference:
/affected/0/versions - Fixed versions
- 3.11.0+dfsg-2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
botan3
Source reference: /affected/1/package/name
- Affected versions
- 3.10.0+dfsg-1
Source reference:
/affected/1/versions3.10.0+dfsg-2Source reference:
/affected/1/versions3.11.0+dfsg-1Source reference:
/affected/1/versions3.7.1+dfsg-2Source reference:
/affected/1/versions3.8.1+dfsg-1Source reference:
/affected/1/versions3.9.0+dfsg-1Source reference:
/affected/1/versions3.9.0+dfsg-2Source reference:
/affected/1/versions3.9.0+dfsg-2.1Source reference:
/affected/1/versions - Fixed versions
- 3.11.0+dfsg-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": "3.11.0+dfsg-2"
}
]
}
],
"package": {
"name": "botan3",
"purl": "pkg:deb/debian/botan3?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.10.0+dfsg-1",
"3.10.0+dfsg-2",
"3.11.0+dfsg-1",
"3.7.1+dfsg-2",
"3.8.1+dfsg-1",
"3.9.0+dfsg-1",
"3.9.0+dfsg-2",
"3.9.0+dfsg-2.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34582.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.0+dfsg-2"
}
]
}
],
"package": {
"name": "botan3",
"purl": "pkg:deb/debian/botan3?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.10.0+dfsg-1",
"3.10.0+dfsg-2",
"3.11.0+dfsg-1",
"3.7.1+dfsg-2",
"3.8.1+dfsg-1",
"3.9.0+dfsg-1",
"3.9.0+dfsg-2",
"3.9.0+dfsg-2.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34582.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56808 · Revision 1
- Added to Heist Feed
- Publisher date