DEBIAN-CVE-2026-18798
Issue summary: QUIC server may double free QRX (QUIC record layer RX) object when channel creation fails for initial packet. Impact summary: Double free leads to heap corruption, which typically results in termination of QUIC server process, leading to Denial of Service. There is so far no evidence that this double free is exploitable for remote code execution, thus it is considered highly improbable. CWE: CWE-415: Double Free Description: In order to validate initial packet, OpenSSL QUIC stack default packet handler (port_default_packet_handler()) creates a so-called QRX object. If the initial packet validates successfully with QRX object, the default packet handler proceeds to channel (connection object) creation. The QRX object used for packet validation is passed to port_bind_channel(), so it becomes part of the newly created connection. If port_bind_channel() fails, then it also frees the QRX object. Once port_bind_channel() returns, the port_default_packet_handler() detects the failure and proceeds to the error branch, where the same QRX object is freed for the second time. The failure in port_bind_channel() function can be induced with a relatively low effort by a malformed (non RFC 9000 compliant) INITIAL packet. If the packet carries DCID (destination connection ID) which is shorter than 8 bytes, then port_bind_channel() jumps to the error path after ossl_quic_lcidm_enrol_odcid() detects that the DCID has invalid length. FIPS impact: no The FIPS module is not affecte
DEBIAN-CVE-2026-18798
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-2026-18798
openssl
Source reference: /affected/0/package/name
- Affected versions
- 3.5.1-1
Source reference:
/affected/0/versions3.5.1-1+deb13u1Source reference:
/affected/0/versions3.5.2-1Source reference:
/affected/0/versions3.5.3-1Source reference:
/affected/0/versions3.5.4-1Source reference:
/affected/0/versions3.5.4-1~deb13u1Source reference:
/affected/0/versions3.5.4-1~deb13u2Source reference:
/affected/0/versions3.5.5-1Source reference:
/affected/0/versions3.5.5-1~deb13u1Source reference:
/affected/0/versions3.5.5-1~deb13u2Source reference:
/affected/0/versions3.5.6-1~deb13u1Source reference:
/affected/0/versions3.5.6-1~deb13u2Source reference:
/affected/0/versions3.5.7-1~deb13u1Source reference:
/affected/0/versions - Fixed versions
- 3.5.7-1~deb13u2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
openssl
Source reference: /affected/1/package/name
- Affected versions
- 3.5.1-1
Source reference:
/affected/1/versions3.5.2-1Source reference:
/affected/1/versions3.5.3-1Source reference:
/affected/1/versions3.5.4-1Source reference:
/affected/1/versions3.5.4-1~deb13u1Source reference:
/affected/1/versions3.5.4-1~deb13u2Source reference:
/affected/1/versions3.5.5-1Source reference:
/affected/1/versions3.5.5-1~deb13u1Source reference:
/affected/1/versions3.5.5-1~deb13u2Source reference:
/affected/1/versions3.5.6-1~deb13u1Source reference:
/affected/1/versions3.5.6-1~deb13u2Source reference:
/affected/1/versions3.5.7-1~deb13u1Source reference:
/affected/1/versions3.5.7-1~deb13u2Source reference:
/affected/1/versions3.6.0-1Source reference:
/affected/1/versions3.6.0-2Source reference:
/affected/1/versions3.6.0~~alpha1-1Source reference:
/affected/1/versions3.6.0~~beta1-1Source reference:
/affected/1/versions3.6.1-1Source reference:
/affected/1/versions3.6.1-2Source reference:
/affected/1/versions3.6.1-3Source reference:
/affected/1/versions3.6.2-1Source reference:
/affected/1/versions3.6.3-1Source reference:
/affected/1/versions - Fixed versions
- 3.6.4-1
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": "3.5.7-1~deb13u2"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.5.1-1",
"3.5.1-1+deb13u1",
"3.5.2-1",
"3.5.3-1",
"3.5.4-1",
"3.5.4-1~deb13u1",
"3.5.4-1~deb13u2",
"3.5.5-1",
"3.5.5-1~deb13u1",
"3.5.5-1~deb13u2",
"3.5.6-1~deb13u1",
"3.5.6-1~deb13u2",
"3.5.7-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18798.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.4-1"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.5.1-1",
"3.5.2-1",
"3.5.3-1",
"3.5.4-1",
"3.5.4-1~deb13u1",
"3.5.4-1~deb13u2",
"3.5.5-1",
"3.5.5-1~deb13u1",
"3.5.5-1~deb13u2",
"3.5.6-1~deb13u1",
"3.5.6-1~deb13u2",
"3.5.7-1~deb13u1",
"3.5.7-1~deb13u2",
"3.6.0-1",
"3.6.0-2",
"3.6.0~~alpha1-1",
"3.6.0~~beta1-1",
"3.6.1-1",
"3.6.1-2",
"3.6.1-3",
"3.6.2-1",
"3.6.3-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18798.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #6090 · Revision 1
- Added to Heist Feed
- Publisher date