Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck
CVE-2026-116725gbsplay through 0.0.103 Out-of-Bounds Read via mapper_map ROM Bank Index
Medium 5.5
In plain English
A medium-severity out-of-bounds read in gbsplay from mmitch. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 96.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
gbsplay through 0.0.103 contains an out-of-bounds read vulnerability in mapper_map() in mapper.c that fails to reject ROM bank indexes beyond the ROM size, causing an underflowed bank length. Attackers can supply crafted .gbr, .gbs or .gb files with malicious bank indexes to make bank_get() read far past the heap ROM buffer and crash the player.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | gbsplay | no fix listed | UBUNTU-CVE-2026-116725 |
| Ubuntu:24.04:LTS | gbsplay | no fix listed | UBUNTU-CVE-2026-116725 |
| Ubuntu:26.04:LTS | gbsplay | no fix listed | UBUNTU-CVE-2026-116725 |
| Ubuntu:26.10 | gbsplay | no fix listed | UBUNTU-CVE-2026-116725 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- GitHub Issue #201 issue-tracking
- https://github.com/mmitch/gbsplay product
- https://github.com/mmitch/gbsplay/commit/a281d80bc56ed63347daf740a2f7aa4f8516165a patch
- https://github.com/mmitch/gbsplay/blob/0.0.103/mapper.c#L71-L103 technical-description
- https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read third-party-advisory
- VulnCheck Advisory: gbsplay through 0.0.103 Out-of-Bounds Read via mapper_map ROM Bank Index third-party-advisory
- https://hackmd.io/@haindpwn/cve-2026-116725-116726-116727-gbsplay-rom-bank-index-oob-read#Attack-flow exploit