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Numeric ErrorsWeakness · CWE-189

CVE-2025-9688

MEDIUM · 5.0 CVSS v3.1 Published 2025-08-30
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
57/100
Remediation priority · Elevated
Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-189

A legacy NVD category grouping numeric mistakes — overflows, truncation, sign errors — where a miscalculated value goes on to drive a dangerous decision such as a memory allocation or a bounds check. It is a bucket rather than one specific bug. Remediation is checked arithmetic and validating any computed size or index before it is used.

General guidance for the numeric errors class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Apply commit 3984137fc0c44110f1ef876adb008885b05a6e18 to current code, or wait for next release after 2.6.0

  1. 1. Navigate to the mupen64plus-core repository: https://github.com/mupen64plus/mupen64plus-core
  2. 2. Locate the commit 3984137fc0c44110f1ef876adb008885b05a6e18 in the commit history
  3. 3. Review the changes made to src/device/cart/is_viewer.c in the write_is_viewer function
  4. 4. Apply the same fix to your local copy: this typically involves adding bounds checking or using a larger integer type to prevent integer overflow when calculating memory addresses or sizes
  5. 5. Rebuild mupen64plus-core with the patched code
  6. 6. Reinstall the updated library

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-9688 in production — separate from our analysis above.

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