DEBIAN-CVE-2026-9539
An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).
DEBIAN-CVE-2026-9539
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-2026-9539
libslirp
Source reference: /affected/0/package/name
- Affected versions
- 4.7.0-1
Source reference:
/affected/0/versions4.8.0-1Source reference:
/affected/0/versions4.9.1-1Source reference:
/affected/0/versions4.9.2-1Source reference:
/affected/0/versions4.9.3-1Source reference:
/affected/0/versions4.9.4-1Source reference:
/affected/0/versions4.9.5-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libslirp
Source reference: /affected/1/package/name
- Affected versions
- 4.8.0-1
Source reference:
/affected/1/versions - Fixed versions
- 4.8.0-1+deb13u1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
libslirp
Source reference: /affected/2/package/name
- Affected versions
- 4.8.0-1
Source reference:
/affected/2/versions4.9.1-1Source reference:
/affected/2/versions - Fixed versions
- 4.9.2-1
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": "libslirp",
"purl": "pkg:deb/debian/libslirp?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.7.0-1",
"4.8.0-1",
"4.9.1-1",
"4.9.2-1",
"4.9.3-1",
"4.9.4-1",
"4.9.5-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9539.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.8.0-1+deb13u1"
}
]
}
],
"package": {
"name": "libslirp",
"purl": "pkg:deb/debian/libslirp?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.8.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9539.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.9.2-1"
}
]
}
],
"package": {
"name": "libslirp",
"purl": "pkg:deb/debian/libslirp?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.8.0-1",
"4.9.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9539.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58422 · Revision 1
- Added to Heist Feed
- Publisher date