CVE-2023-39327: A flaw was found in OpenJPEG

Routine

MEDIUM 4.3DOWNGRADE

CVE-2023-39327 is a medium-severity flaw (CVSS 4.3) affecting openjpeg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in OpenJPEG. Maliciously constructed pictures can cause the program to enter a large loop and continuously print warning messages on the terminal.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-400
Published	2024-07-13
Last modified	2026-09-21

Publisher (CNA): Red Hat, Inc. · Vendor: uclouvain

Last updated 2026-09-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-07-13 03:15 UTCPublished CVE record published
2026-09-21 18:17 UTCUpdated Record last modified

uclouvain openjpeg DOWNGRADE

Affected: all versions · 2.0 · 2.5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy openjpeg || rpm -q openjpeg || openjpeg --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison openjpeg sudo apt install openjpeg=<VERSION_BEFORE_2.0> sudo apt-mark hold openjpeg

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

dnf --showduplicates list openjpeg sudo dnf downgrade openjpeg-<VERSION_BEFORE_2.0> sudo dnf versionlock add openjpeg

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-2023-39327?

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

Is CVE-2023-39327 being exploited?

CVE-2023-39327 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-2023-39327 affect?

CVE-2023-39327 affects openjpeg. Severity is medium (CVSS 4.3). A flaw was found in OpenJPEG. Maliciously constructed pictures can cause the program to enter a large loop and continuously print warning messages on the terminal.

How urgent is CVE-2023-39327?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2023-39329 MEDIUM 6.5 DOWNGRADE A flaw was found in OpenJPEG
CVE-2023-39328 MEDIUM 5.5 DOWNGRADE A vulnerability was found in OpenJPEG similar to CVE-2019-6988
CVE-2025-54874 CRITICAL 9.8 UPGRADE OpenJPEG is an open-source JPEG 2000 codec
CVE-2025-50952 MEDIUM 6.5 DOWNGRADE openjpeg v 2.5.0 was discovered to contain a NULL pointer dereference via the component /openjp2/dwt.c.

References

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