CVE-2025-55212VulnerabilityPublished 26 Aug 2025Updated 3 Nov 2025

Magick.NET Q16 AnyCPU: ImageMagick affected by divide-by-zero in ThumbnailImage via montage -geometry ":" leads to

Affects Magick.NET-Q16-AnyCPUSource GCVE Database

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Authoritative record:CVE-2025-55212· Low 3.7

Not known to be exploited · CVSS 3.7 Low : upgrade to 14.8.1 when convenient.

Data as of 29 Oct 2026, 22:52 UTC

CVSS 3.1 base score

3.7Low

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (GitHub_M)	CVSS 3.1	3.7

Patch: Available – fixed in 14.8.1

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

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Aug 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Magick.NET-Q16-AnyCPU and Magick.NET-Q16-HDRI-AnyCPU and Magick.NET-Q16-HDRI-OpenMP-arm64 and Magick.NET-Q16-HDRI-OpenMP-x64 and Magick.NET-Q16-HDRI-arm64 and Magick.NET-Q16-HDRI-x64 and Magick.NET-Q16-HDRI-x86 and Magick.NET-Q16-OpenMP-arm64 and Magick.NET-Q16-OpenMP-x64 and Magick.NET-Q16-arm64 and Magick.NET-Q16-x64 and Magick.NET-Q16-x86 and Magick.NET-Q8-AnyCPU and Magick.NET-Q8-OpenMP-arm64 and Magick.NET-Q8-OpenMP-x64 and Magick.NET-Q8-arm64 and Magick.NET-Q8-x64 and Magick.NET-Q8-x86 to 14.8.1.

Affected software

Product	Affected	Fixed in
NuGetMagick.NET-Q16-AnyCPU	Affected <14.8.1	Fixed in 14.8.1
NuGetMagick.NET-Q16-HDRI-AnyCPU	Affected <14.8.1	Fixed in 14.8.1
NuGetMagick.NET-Q16-HDRI-OpenMP-arm64	Affected <14.8.1	Fixed in 14.8.1
NuGetMagick.NET-Q16-HDRI-OpenMP-x64	Affected <14.8.1	Fixed in 14.8.1
NuGetMagick.NET-Q16-HDRI-arm64	Affected <14.8.1	Fixed in 14.8.1
NuGetMagick.NET-Q16-HDRI-x64	Affected <14.8.1	Fixed in 14.8.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

## Summary Passing a geometry string containing only a colon (":") to montage -geometry leads GetGeometry() to set width/height to 0. Later, ThumbnailImage() divides by these zero dimensions, triggering a crash (SIGFPE/abort), resulting in a denial of service. ## Details **Root Cause** 1. `montage -geometry ":" ...` reaches `MagickCore/geometry.c:GetGeometry().` 2. `StringToDouble/InterpretLocaleValue` parses `":"` as `0.0;` then: https://github.com/ImageMagick/ImageMagick/blob/0ba1b587be17543b664f7ad538e9e51e0da59d17/MagickCore/geometry.c#L355 `WidthValue` (and/or `HeightValue)` is set with a zero dimension. 3. In MagickCore/resize.c:ThumbnailImage(), the code computes: https://github.com/ImageMagick/ImageMagick/blob/0ba1b587be17543b664f7ad538e9e51e0da59d17/MagickCore/resize.c#L4625-L4629 causing a division by zero and immediate crash. The issue is trivially triggerable without external input files (e.g., using `xc:white`). ### Reproduction Environment ``` Version: ImageMagick 7.1.2-1 (Beta) Q16-HDRI x86_64 0ba1b587b:20250812 https://imagemagick.org Features: Cipher DPC HDRI Delegates (built-in): bzlib fontconfig freetype jbig jng jpeg lcms lzma pangocairo png tiff x xml zlib Compiler: clang (14.0.0) OS/Arch: Linux x86_64 ``` Steps ``` ./bin/magick montage -geometry : xc:white null: ``` Observed result ``` IOT instruction (core dumped) # (Environment-dependent: SIGFPE/abort may be observed.) ``` ## PoC No external file required; the pseudo image xc:white suffices: ``` ./bin/magick montage -geometry : xc:white null: ``` ## Impact - **Denial of Service:** A divide-by-zero in `ThumbnailImage()` causes immediate abnormal termination (e.g., SIGFPE/abort), crashing the ImageMagick process. ## Suggested fix Defensively reject zero dimensions early in `ThumbnailImage()`: ```c if ((columns == 0) || (rows == 0)) { (void) ThrowMagickException(exception, GetMagickModule(), OptionError, "InvalidGeometry", "thumbnail requires non-zero dimensions: %.20gx%.20g", (double) columns, (double) rows); return (Image *) NULL; } ``` Additionally, consider tightening validation in `GetGeometry()` so that colon-only (and similar malformed) inputs do not yield `WidthValue/HeightValue` with zero, or are rejected outright. Variants like `"x:"` or `":x"` may also need explicit handling (maintainer confirmation requested). ## Credits ### Team Daemon Fuzz Hunters **Bug Hunting Master Program, HSpace/Findthegap** <br> **Woojin Park** @jin-156 [1203kids@gmail.com](mailto:1203kids@gmail.com) **Hojun Lee** @leehohojune [leehojune@korea.ac.kr](mailto:leehojune@korea.ac.kr) **Youngin Won** @amethyst0225 [youngin04@korea.ac.kr](mailto:youngin04@korea.ac.kr) **Siyeon Han** @hanbunny [kokosyeon@gmail.com](mailto:kokosyeon@gmail.com)

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Description

WeaknessesCWE-369

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