CVE-2023-39327Public exploitNetwork attack vector

Processing hang via missing EPH marker

Published Jul 13, 2024 · Updated Mar 9, 2026

Resource consumption in OpenJPEG 2.5.0 allows remote attackers to interrupt image processing through a crafted JPEG 2000 file. opj_t2_read_packet_header treats missing required EPH markers as warnings and continues parsing without advancing past the malformed data, repeatedly emitting warnings. Delivery is remote and unauthenticated, but a user or application must process the file; the affected process can remain in the loop for hours.

CVSS severity4.3
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource consumption in OpenJPEG 2.5.0 allows remote attackers to interrupt image processing through a crafted JPEG 2000 file. opj_t2_read_packet_header treats missing required EPH markers as warnings and continues parsing without advancing past the malformed data, repeatedly emitting warnings. Delivery is remote and unauthenticated, but a user or application must process the file; the affected process can remain in the loop for hours.

The record

CVE
CVE-2023-39327
Published
Jul 13, 2024
Updated
Mar 9, 2026
Vendor
Red Hat
Product
Red Hat Enterprise Linux 8
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
Université catholique de Louvain · OpenJPEGversion=2.5.0
389 Directory Server · Red Hat AI Inference Server 3.2Affected versions are unavailable in this record.

Published CVSS scores

4.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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