VULNERABILITY INTELLIGENCE
CVE-2026-9539
CVSS score6.5 MEDIUM
EPSS probability0.22%
CISA KEVNot currently listed
Published2026-06-24
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Description
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).
Weakness classification
- info@starlabs.sg: CWE-125