GHSA-v3j6-27vc-7pw2 CVE-2026-61858
ImageMagick: Policy Bypass in APNG encoder and delegates due to a missing check
Medium
NuGet
- Severity
- 4.8 / 10
- Medium · CVSS 4.0
- Exploit chance (EPSS)
- 0.25%
- Chance of exploitation in the next 30 days. Higher than 15.97% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
- CWE-862 Missing Authorization
- Fix
- Available
- 17 packages have a fixed version
Description
Due to a missing check in the APNG encoder and external delegates it is possibly to bypass the policy and write to a disallowed path.
Affected versions
NuGet
| Package | Vulnerable | Fixed in |
|---|---|---|
| Magick.NET-Q16-AnyCPU | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-HDRI-AnyCPU | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-HDRI-OpenMP-arm64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-HDRI-arm64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-HDRI-x64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-HDRI-x86 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-OpenMP-arm64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-OpenMP-x64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-arm64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-x64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q16-x86 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q8-AnyCPU | < 14.15.0 |
14.15.0 |
| Magick.NET-Q8-OpenMP-arm64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q8-OpenMP-x64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q8-arm64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q8-x64 | < 14.15.0 |
14.15.0 |
| Magick.NET-Q8-x86 | < 14.15.0 |
14.15.0 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
Magick.NET-Q16-AnyCPU NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-AnyCPU --version 14.15.0
Magick.NET-Q16-HDRI-AnyCPU NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.15.0
Magick.NET-Q16-HDRI-OpenMP-arm64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.15.0
Magick.NET-Q16-HDRI-arm64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-HDRI-arm64 --version 14.15.0
Magick.NET-Q16-HDRI-x64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-HDRI-x64 --version 14.15.0
Magick.NET-Q16-HDRI-x86 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-HDRI-x86 --version 14.15.0
Magick.NET-Q16-OpenMP-arm64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-OpenMP-arm64 --version 14.15.0
Magick.NET-Q16-OpenMP-x64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-OpenMP-x64 --version 14.15.0
Magick.NET-Q16-arm64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-arm64 --version 14.15.0
Magick.NET-Q16-x64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-x64 --version 14.15.0
Magick.NET-Q16-x86 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q16-x86 --version 14.15.0
Magick.NET-Q8-AnyCPU NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q8-AnyCPU --version 14.15.0
Magick.NET-Q8-OpenMP-arm64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q8-OpenMP-arm64 --version 14.15.0
Magick.NET-Q8-OpenMP-x64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q8-OpenMP-x64 --version 14.15.0
Magick.NET-Q8-arm64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q8-arm64 --version 14.15.0
Magick.NET-Q8-x64 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q8-x64 --version 14.15.0
Magick.NET-Q8-x86 NuGet → 14.15.0
- dotnet
dotnet add package Magick.NET-Q8-x86 --version 14.15.0
Severity breakdown
CVSS 4.0 4.8
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Attack vector
- Local
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- Low
- User interaction
- None
- Confidentiality (vulnerable system)
- None
- Integrity (vulnerable system)
- Low
- Availability (vulnerable system)
- None
- Confidentiality (subsequent systems)
- None
- Integrity (subsequent systems)
- None
- Availability (subsequent systems)
- None
- Exploit maturity
- Not defined
- Scope
- X
CVSS 3.1 3.3
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Weakness
CWE-59: Improper Link Resolution Before File Access ('Link Following')
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
How to prevent it
- Architecture and Design: Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
CWE-862: Missing Authorization
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
How to prevent it
- Architecture and Design: Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
- Architecture and Design: Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].
- Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
- Architecture and Design: For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page. One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
- System Configuration, Installation: Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.
References
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-j7hp-h8jx-5ppr libwebp: OOB write in BuildHuffmanTable | High Known exploited | Also affects magick.net-q16-anycpu |
| GHSA-cvhv-g4rq-3hmw ImageMagick: Memory Leak when providing invalid options to the cli | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-h22j-f9xw-xjjm ImageMagick: Integer Overflow in JNX decoder causes heap buffer over-write when processing extremly large files on 32-bit builds | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-422r-8c97-xcg4 ImageMagick: Heap Buffer Over-Write in fx operation | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-f5m7-cqgw-8hm7 ImageMagick: Heap Buffer Over-Write in morphology operation when an invalid kernel is provided | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-hc76-7mpc-qjqh ImageMagick: Code injection in HTML encoder due to incomplete fix of CVE-2026-25797 | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-56m6-8q75-f2rw ImageMagick: Policy Bypass due to an incomplete fix of CVE-2026-49219 | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-h5r4-w88w-7ccr ImageMagick: Memory Leak in TIFF encoder when invalid tiff:tile-geometry is specified | Low | Also affects Magick.NET-Q16-AnyCPU |
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