CVE-2024-56826Public exploit

Process crash via color-conversion out-of-bounds read

Published Jan 9, 2025 · Updated Nov 6, 2025

A heap buffer overflow in OpenJPEG on Red Hat Enterprise Linux 9 allows local users to crash opj_decompress with a crafted JPEG 2000 image. In sycc422_to_rgb in bin/common/color.c, a 4:2:2 color-conversion loop reads past its heap allocation when the luma width is one greater than twice either chroma width. Triggering the fault requires running the utility with reduction level 2 on the malformed image; the demonstrated consequence is a deterministic process abort, while the source record also identifies undefined behavior.

CVSS severity5.6
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap buffer overflow in OpenJPEG on Red Hat Enterprise Linux 9 allows local users to crash opj_decompress with a crafted JPEG 2000 image. In sycc422_to_rgb in bin/common/color.c, a 4:2:2 color-conversion loop reads past its heap allocation when the luma width is one greater than twice either chroma width. Triggering the fault requires running the utility with reduction level 2 on the malformed image; the demonstrated consequence is a deterministic process abort, while the source record also identifies undefined behavior.

The record

CVE
CVE-2024-56826
Published
Jan 9, 2025
Updated
Nov 6, 2025
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 9
Classifications
CWE-122, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2025Record 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 vectorlocal
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

5.6Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499.004Application or System Exploitation

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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