VDB
CVE-2026-9539
CVE-2026-9539
PUBLISHED
CVSS 6.5 MEDIUM
Reported by STAR_Labs · Published June 24, 2026
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).
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| freedesktop.org | libslirp | 0 |
| freedesktop.org | libslirp | 0 |
Timeline
- Jun 24, 2026 EPSS Score
- Jun 24, 2026 Coalition ESS Score
- Jun 24, 2026 CVE Published
- Jun 24, 2026 CVE Updated
- Aug 24, 2026 EPSS Score
- Sep 5, 2026 EPSS Score