6.5

CVE-2026-9539: freedesktop.org libslirp Out-of-bounds Read

CVSS: 6.5v3.1MediumAwaiting analysis
AliasesMGASA-2026-0306SUSE-SU-2026:22452-1SUSE-SU-2026:22514-1
Published 24-06-2026Last modified 24-06-2026
Open JSON

Vulnerability summary

CVE-2026-9539 is a medium (CVSS 6.5) Out-of-bounds Read vulnerability in freedesktop.org libslirp. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.9% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-06-2026
    PublishedVulnerability first disclosed.
  2. 24-06-2026
    Last modifiedVulnerability information updated.

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).

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

0.00 pp

From 0.22% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Suse6 products
  • libslirp&distro=SUSE Linux Enterprise Micro 5.3< 4.7.0+44-150300.18.1
  • libslirp&distro=SUSE Linux Enterprise Micro 5.4< 4.7.0+44-150300.18.1
  • libslirp&distro=SUSE Linux Enterprise Micro 5.5< 4.7.0+44-150500.4.3.1
  • libslirp&distro=SUSE Linux Enterprise Module for Basesystem 15 SP7< 4.7.0+44-150500.4.3.1
  • libslirp&distro=SUSE Linux Micro 6.0< 4.7.0+44-5.1
Mageia2 products
  • libslirp< 4.8.0-2.1.mga10
  • libslirp< 4.6.1-1.1.mga9
Opensuse2 products
  • libslirp&distro=openSUSE Leap 16.0< 4.8.0+2-160000.3.1
  • libslirp&distro=openSUSE Tumbleweed< 4.9.3+4-1.1
Debian1 product
  • libslirpAll versions (No fix recorded) | < 4.8.0-1+deb13u1 | < 4.9.2-1
Freedesktop.org1 product
Ubuntu1 product
  • libslirpAll versions (No fix recorded) | < 4.6.1-1ubuntu0.2 | < 4.7.0-1ubuntu3.1 | < 4.9.1-1ubuntu1.1

6 vendors · 13 products

References

17 links
Show all 17 references