Out-of-bounds Read in Mmitch Gbsplay
CVE-2026-116725
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/mmitch/gbsplay/issues/201 (issue-tracking)
- github.com/mmitch/gbsplay (product)
- github.com/mmitch/gbsplay/commit/a281d80bc56ed63347daf740a2f7aa4f8516165a (patch)
- github.com/mmitch/gbsplay/blob/0.0.103/mapper.c (technical-description)
- hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read (third-party-advisory)
- www.vulncheck.com/advisories/gbsplay-through-0.0.103-out-of-bounds-read-via-map… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116725?
- CVE-2026-116725 is a medium-severity vulnerability in Mmitch Gbsplay, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-10-26.
- How severe is CVE-2026-116725?
- Medium severity. CVSS v3 base score is 5.5 out of 10.