CVE-2026-26284
Description
A flaw was found in ImageMagick, a free and open-source software used for editing and manipulating digital images. When processing Huffman-coded data from Photo CD (PCD) files, the image decoder contains an incorrect initialization that could lead to an out-of-bounds read. This vulnerability could allow a remote attacker to cause information disclosure or a denial of service.
Statement
This MODERATE impact vulnerability in ImageMagick involves a heap overflow in the PCD (Photo CD) decoder, leading to an out-of-bounds read when processing Huffman-coded data. An attacker could exploit this by providing a specially crafted PCD file. Red Hat Enterprise Linux 6 ELS and 7 ELS are affected.
Mitigation
To mitigate this issue, restrict ImageMagick's ability to process PCD (Photo CD) files by disabling the PCD coder. This can be done by adding or modifying a policy entry in the ImageMagick configuration file, typically located at `/etc/ImageMagick-X/policy.xml` (where 'X' is the ImageMagick version). Add the following line within the `<policymap>` tags:
xml
<policy domain="coder" rights="none" pattern="PCD" />
Applications utilizing ImageMagick may require a restart for this change to take effect. This action will prevent ImageMagick from processing PCD files, which may affect functionality dependent on this format.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | 9.1 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | High | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | Low | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Availability,Confidentiality
Technical Impact: DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands; Read Memory; Modify Memory
If the incorrect calculation is used in the context of memory allocation, then the software may create a buffer that is smaller or larger than expected. If the allocated buffer is smaller than expected, this could lead to an out-of-bounds read or write (CWE-119), possibly causing a crash, allowing arbitrary code execution, or exposing sensitive data.
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