What’s Vulnerable › Vulnerabilities

CVE-2026-116725: gbsplay through 0.0.103 Out-of-Bounds Read via mapper_map ROM Bank Index

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-27
• Weakness: CWE-125

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 products

• mmitch gbsplay: through 0.0.103

References

• https://github.com/mmitch/gbsplay
• https://github.com/mmitch/gbsplay/blob/0.0.103/mapper.c#L71-L103
• https://github.com/mmitch/gbsplay/commit/a281d80bc56ed63347daf740a2f7aa4f8516165a
• https://github.com/mmitch/gbsplay/issues/201
• https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read
• https://www.vulncheck.com/advisories/gbsplay-through-0.0.103-out-of-bounds-read-via-mapper-map-rom-bank-index

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