CVE-2026-56361
Description
A flaw was found in ImageMagick. An attacker can exploit an off-by-one error in the morphology validation by providing incorrect morphology parameters. This can lead to out-of-bounds heap buffer reads and heap buffer overflow, potentially causing memory access violations.
Statement
This flaw in ImageMagick is rated as Low impact. An attacker can trigger a memory access violation by submitting a maliciously crafted image.
Red Hat has rated this low as there is no impact to the confidentiality of the data and availability is low as denial-of-service is strictly localized to the process handling that specific file.
Mitigation
To reduce exposure, avoid processing untrusted image files with ImageMagick, particularly those that may contain malformed morphology parameters. If processing untrusted content is necessary, consider implementing sandboxing mechanisms to isolate ImageMagick operations and limit the potential blast radius of any successful exploitation.
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 | 3.3 | 7.1 | 3.3 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | Required | Required | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | High | None |
| Integrity Impact | None | None | None |
| Availability Impact | Low | High | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Red Hat CVSS v3 Score Explanation
NVD has scored this 7.1 with 7.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H: Red Hat rating is 3.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Confidentiality: Although the vulnerability is technically an "out-of-bounds read," the memory access violation only attempts to read a single out-of-bounds pixel (4 bytes of heap memory). The application subsequently crashes rather than exfiltrating or exposing sensitive memory to the attacker. Therefore, the impact on data confidentiality is non-existent.
The availability impact is scored as "Low" because it typically only causes the single image-processing task to fail rather than bringing down an entire host server or continuous service. The denial-of-service condition is strictly localized to the process handling that specific file.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
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