CVE-2026-25966
Description
A flaw was found in ImageMagick. The "secure" security policy, intended to prevent reading and writing from standard streams, can be bypassed. An attacker can exploit this by using fd:
Statement
This MODERATE impact flaw in ImageMagick allows a security policy bypass through the use of fd:<n> pseudo-filenames, enabling unauthorized access to standard input/output despite the "secure" policy. Red Hat Enterprise Linux 6 ELS and 7 ELS, as well as community projects like Fedora and EPEL, are affected by this vulnerability. Exploitation requires an attacker to provide a specially crafted image or command that leverages this bypass.
Mitigation
To mitigate this issue, modify the ImageMagick security policy file, typically located at `/etc/ImageMagick-X/policy.xml` (where X is the version), to explicitly deny access to `fd:` pseudo-filenames. Add a policy rule similar to `<policy domain="delegate" rights="none" pattern="fd:*" />` within the `<policymap>` section. This change will prevent ImageMagick from processing `fd:` paths, thereby closing the bypass. A restart of any services utilizing ImageMagick may be required for the policy change to take effect.
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 | 5.9 | 7.8 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | High | N/A |
| Integrity Impact | Low | High | N/A |
| Availability Impact | Low | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Attackers may be able to find other malicious inputs that were not expected by the developer, allowing them to bypass the intended protection mechanism.
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