CVE-2026-27799
Description
A flaw was found in ImageMagick, a software suite used for editing and manipulating digital images. This vulnerability, a heap buffer over-read, exists within the component that handles DJVU image files. A local attacker could exploit this by processing a specially crafted DJVU image, leading to an error where the software miscalculates memory allocation due to an integer truncation. This causes the software to attempt to read memory outside its designated boundaries, which can result in a denial of service or potentially corrupt data.
Statement
This MODERATE impact vulnerability in ImageMagick involves a heap buffer over-read within the DJVU image format handler. The flaw occurs due to an integer truncation during stride calculation for pixel buffer allocation, leading to out-of-bounds memory reads when processing a specially crafted DJVU image. Red Hat Enterprise Linux 6 ELS and 7 ELS are affected.
Mitigation
To mitigate this issue, avoid processing untrusted DJVU image files with ImageMagick. For server deployments, restrict network access to services that use ImageMagick for image processing. As an additional measure, consider disabling the DJVU delegate in ImageMagick's policy.xml configuration to prevent the processing of DJVU files. This may impact functionality that relies on DJVU image support.
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 | 4 | 4.4 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | High | Low | N/A |
| Privileges Required | None | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | Low | Low | N/A |
| Availability Impact | Low | Low | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
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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