CVE-2023-27566: Cubism Core in Live2D Cubism Editor 4.2.03 allows out-of-bounds write via a crafted Section Offset Table or Co

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HIGH 7.8DOWNGRADE

CVE-2023-27566 is a high-severity flaw (CVSS 7.8) affecting cubism editor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cubism Core in Live2D Cubism Editor 4.2.03 allows out-of-bounds write via a crafted Section Offset Table or Count Info Table in an MOC3 file.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-03-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: live2d

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-03-03 20:15 UTCPublished CVE record published
2026-06-17 05:45 UTCUpdated Record last modified

live2d cubism editor DOWNGRADE

Affected: 4.2.03

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2.03

1. Check installed version

apt-cache policy cubism-editor || rpm -q cubism-editor || cubism-editor --version

2. No fixed release: DOWNGRADE to a release before 4.2.03 (Debian / Ubuntu)

apt-cache madison cubism-editor sudo apt install cubism-editor=<VERSION_BEFORE_4.2.03> sudo apt-mark hold cubism-editor

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cubism-editor sudo dnf downgrade cubism-editor-<VERSION_BEFORE_4.2.03> sudo dnf versionlock add cubism-editor

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-27566?

cubism editor: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-27566 being exploited?

CVE-2023-27566 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-27566 affect?

CVE-2023-27566 affects cubism editor. Severity is high (CVSS 7.8). Cubism Core in Live2D Cubism Editor 4.2.03 allows out-of-bounds write via a crafted Section Offset Table or Count Info Table in an MOC3 file.

How urgent is CVE-2023-27566?

Priority 44/100. High severity; Public exploit reference

References

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