CVE-2023-26234: JD-GUI 1.6.6 allows deserialization via UIMainWindowPreferencesProvider.singleInstance.

This month

MEDIUM 6.6DOWNGRADE

CVE-2023-26234 is a medium-severity flaw (CVSS 6.6) affecting jd-gui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JD-GUI 1.6.6 allows deserialization via UIMainWindowPreferencesProvider.singleInstance.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.6 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-502
Published	2023-02-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jd-gui project

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

Am I affected?

Timeline

2023-02-21 00:15 UTCPublished CVE record published
2026-06-17 05:42 UTCUpdated Record last modified

jd-gui project jd-gui DOWNGRADE

Affected: 1.6.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6.6

1. Check installed version

apt-cache policy jd-gui || rpm -q jd-gui || jd-gui --version

2. No fixed release: DOWNGRADE to a release before 1.6.6 (Debian / Ubuntu)

apt-cache madison jd-gui sudo apt install jd-gui=<VERSION_BEFORE_1.6.6> sudo apt-mark hold jd-gui

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

dnf --showduplicates list jd-gui sudo dnf downgrade jd-gui-<VERSION_BEFORE_1.6.6> sudo dnf versionlock add jd-gui

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-2023-26234?

jd-gui: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-26234 being exploited?

CVE-2023-26234 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-2023-26234 affect?

CVE-2023-26234 affects jd-gui. Severity is medium (CVSS 6.6). JD-GUI 1.6.6 allows deserialization via UIMainWindowPreferencesProvider.singleInstance.

How urgent is CVE-2023-26234?

Priority 43/100. Public exploit reference

Related CVEs

CVE-2023-26235 MEDIUM 6.1 DOWNGRADE JD-GUI 1.6.6 allows XSS via util/net/InterProcessCommunicationUtil.java.

References

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