CVE-2026-9539
libslirp TCP URG OOB Read Information Leak
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).
INFO
Published Date :
June 24, 2026, 4:37 a.m.
Last Modified :
June 24, 2026, 4:37 a.m.
Remotely Exploit :
No
Source :
STAR_Labs
Affected Products
The following products are affected by CVE-2026-9539
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | b1571b85-cbc9-431f-830b-0c8155323a69 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update libslirp to v4.9.2 or later.
- Apply vendor-provided patches for libslirp.
- Limit guest VM network privileges if possible.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-9539 vulnerability anywhere in the article.