Integer overflow in Mupen64plus
CVE-2025-9688
A security vulnerability has been detected in Mupen64Plus up to 2.6.0. The affected element is the function write_is_viewer of the file src/device/cart/is_viewer.c. The manipulation leads to integer overflow. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitability is described as difficult. The exploit has been disclosed publicly and may be used. The identifier of the patch is 3984137fc0c44110f1ef876adb008885b05a6e18. To fix this issue, it is recommended to deploy a patch.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (18.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Mupen64plus — versions 2.0, 2.1, 2.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/Giles-one/mupen64plusEscape/tree/main/BUG10 (exploit)
- github.com/mupen64plus/mupen64plus-core/commit/3984137fc0c44110f1ef876adb008885… (patch)
Frequently asked questions
- What is CVE-2025-9688?
- CVE-2025-9688 is a medium-severity vulnerability in Mupen64plus, classified under CWE-189. CVSS score: 5.0/10. Published 2025-08-30.
- How severe is CVE-2025-9688?
- Medium severity. CVSS v3 base score is 5.0 out of 10.
- Is CVE-2025-9688 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.