Medium severity · published Oct 26, 2026
CVE-2026-116725
gbsplay through 0.0.103 Out-of-Bounds Read via mapper_map ROM Bank Index
New
5.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GB
gbsplay · mmitch
through 0.0.103 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116725
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116725
github.com
https://github.com/mmitch/gbsplay
github.com
https://github.com/mmitch/gbsplay/blob/0.0.103/mapper.c#L71-L103
github.com
https://github.com/mmitch/gbsplay/commit/a281d80bc56ed63347daf740a2f7aa4f8516165a
github.com
https://github.com/mmitch/gbsplay/issues/201
hackmd.io
https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read
www.vulncheck.com
https://www.vulncheck.com/advisories/gbsplay-through-0.0.103-out-of-bounds-read-via-mapper-map-rom-bank-index
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3.3
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gbsplay through 0.0.103 Heap Out-of-Bounds Read via gbr_open GBR Title