ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2025-66628: 0.51% estimated exploitation activity in the next 30 days; percentile 43.57 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The TIM (PSX TIM) image parser in ImageMagick contains a critical integer overflow vulnerability in the ReadTIMImage function (coders/tim.c). The code reads width and height (16-bit values) from the file header and calculates imagesize = 2 width height without checking for overflow. On 32-bit systems (or where sizet is 32-bit), this calculation can overflow if width and height are large (e.g., 65535), wrapping around to a small value. This results in a small heap allocation via AcquireQuantumMemory and later operations relying on the dimensions can trigger an out of bounds read. Vulnerable Code File: coders/tim.c Impact This vulnerability can lead to Arbitrary Memory Disclosure due to an out of bounds read on 32-bit systems.

Published by the source

10 Dec 2025, 15:47 UTC

Last modified by the source

10 Dec 2025, 15:47 UTC

Source last checked

26 Oct 2026, 17:04 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-6hjr-v6g4-3fm8

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# Patch Next advisory brief: CVE-2025-66628

Advisory: ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)
IDs: CVE-2025-66628, GHSA-6hjr-v6g4-3fm8
Record: https://patchnext.com/advisories/cve-2025-66628 (revision 1, source checked 26 Oct 2026, 17:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: magick.net-q8-x86 14.10.0; magick.net-q16-hdri-anycpu 14.10.0; magick.net-q16-anycpu 14.10.0; magick.net-q16-hdri-x86 14.10.0; magick.net-q16-x86 14.10.0; magick.net-q8-anycpu 14.10.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet magick.net-q8-x86: affected < 14.10.0; fixed in 14.10.0
- NuGet magick.net-q16-hdri-anycpu: affected < 14.10.0; fixed in 14.10.0
- NuGet magick.net-q16-anycpu: affected < 14.10.0; fixed in 14.10.0
- NuGet magick.net-q16-hdri-x86: affected < 14.10.0; fixed in 14.10.0
- NuGet magick.net-q16-x86: affected < 14.10.0; fixed in 14.10.0
- NuGet magick.net-q8-anycpu: affected < 14.10.0; fixed in 14.10.0

## Suggested inspection (read-only)
- NuGet magick.net-q8-x86: check the installed version with your package manager.
- NuGet magick.net-q16-hdri-anycpu: check the installed version with your package manager.
- NuGet magick.net-q16-anycpu: check the installed version with your package manager.
- NuGet magick.net-q16-hdri-x86: check the installed version with your package manager.
- NuGet magick.net-q16-x86: check the installed version with your package manager.
- NuGet magick.net-q8-anycpu: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on magick.net-q8-x86, magick.net-q16-hdri-anycpu, magick.net-q16-anycpu, magick.net-q16-hdri-x86, magick.net-q16-x86, magick.net-q8-anycpu.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-6hjr-v6g4-3fm8 (GitHub-reviewed advisory GHSA-6hjr-v6g4-3fm8 lists affected ranges: NuGet magick.net-q16-anycpu >=0 =0 =0 =0 =0 =0 <14.10.0)

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