# CVE-2026-116727: gbsplay through 0.0.103 Heap Out-of-Bounds Read via vgm_open in gbs.c

Status: published. Published: 2026-10-26. Updated: 2026-11-05.

gbsplay through 0.0.103 contains a heap out-of-bounds read vulnerability in vgm_open() in gbs.c that walks the VGM command stream without bounds checks. Attackers can supply a crafted VGM file with wait opcodes and no 0x66 terminator to read past the heap buffer and crash the player.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/mmitch/gbsplay/commit/91b1f6df0abd3914f91caa528ec3213d731999e8

## Affected products and versions

- mmitch / gbsplay (mmitch/gbsplay): ≥ 0; ≤ 0.0.103 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 4.8 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 3.3 (low); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L; source: CNA: VulnCheck

- CVSS 4.0: 4.8 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 3.3 (low); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-05; percentile 2.82%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

- exploit: https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read (ADP: CISA-ADP)

## References

- https://github.com/mmitch/gbsplay/issues/201 (CNA: VulnCheck; issue-tracking)

- https://github.com/mmitch/gbsplay (CNA: VulnCheck; product)

- https://github.com/mmitch/gbsplay/commit/91b1f6df0abd3914f91caa528ec3213d731999e8 (CNA: VulnCheck; patch)

- https://github.com/mmitch/gbsplay/blob/0.0.103/gbs.c#L996-L1010 (CNA: VulnCheck; technical-description)

- https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read (CNA: VulnCheck; third-party-advisory)

- https://www.vulncheck.com/advisories/gbsplay-through-0.0.103-heap-out-of-bounds-read-via-vgm-open-in-gbs-c (CNA: VulnCheck; third-party-advisory)

- https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read (ADP: CISA-ADP; exploit)

- https://github.com/mmitch/gbsplay (disclosure@vulncheck.com)

- https://github.com/mmitch/gbsplay/blob/0.0.103/gbs.c#L996-L1010 (disclosure@vulncheck.com)

- https://github.com/mmitch/gbsplay/commit/91b1f6df0abd3914f91caa528ec3213d731999e8 (disclosure@vulncheck.com)

- https://github.com/mmitch/gbsplay/issues/201 (disclosure@vulncheck.com)

- https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/gbsplay-through-0.0.103-heap-out-of-bounds-read-via-vgm-open-in-gbs-c (disclosure@vulncheck.com)

- https://hackmd.io/@haindpwn/gbsplay-rom-bank-index-oob-read (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-116727; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-116727; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116727; retrieved 2026-11-05; source updated Not reported

Revision: db79154e96ea066becc5773f8200e0d0b4ef151651774ed76b5b80cc569a9092

Canonical: https://y2.dev/cve/CVE-2026-116727

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