ImageMagick BlobStream Forward-Seek Under-Allocation

Exploitation

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

CVSS

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

EPSS

• CVE-2025-57807: 0.29% estimated exploitation activity in the next 30 days; percentile 21.81 (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.

Reporter: Lumina Mescuwa Product: ImageMagick 7 (MagickCore) Component: MagickCore/blob.c (Blob I/O - BlobStream) Tested: 7.1.2-0 (source tag) and 7.1.2-1 (Homebrew), macOS arm64, clang-17, Q16-HDRI Impact: Heap out-of-bounds WRITE (attacker-controlled bytes at attacker-chosen offset) → memory corruption; potential code execution --- Executive Summary For memory-backed blobs (BlobStream), SeekBlob() permits advancing the stream offset beyond the current end without increasing capacity. The subsequent WriteBlob() then expands by quantum + length (amortized) instead of offset + length, and copies to data + offset. When offset ≫ extent, the copy targets memory beyond the allocation, producing a deterministic heap write on 64-bit builds. No 2⁶⁴ arithmetic wrap, external delegates, or policy settings are required. --- Affected Scope - Versions confirmed: 7.1.2-0, 7.1.2-1 - Architectures: Observed on macOS arm64; architecture-agnostic on LP64 - Paths: MagickCore blob subsystem — BlobStream…

Published by the source

5 Sep 2025, 20:09 UTC

Last modified by the source

3 Nov 2025, 21:35 UTC

Source last checked

26 Oct 2026, 17:04 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-23hg-53q6-hqfg

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# Patch Next advisory brief: CVE-2025-57807

Advisory: ImageMagick BlobStream Forward-Seek Under-Allocation
IDs: CVE-2025-57807, GHSA-23hg-53q6-hqfg
Record: https://patchnext.com/advisories/cve-2025-57807 (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: Low (CVSS 3.8)
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-arm64 14.8.2; magick.net-q16-openmp-x64 14.8.2; magick.net-q16-hdri-openmp-arm64 14.8.2; magick.net-q16-hdri-arm64 14.8.2; magick.net-q8-openmp-x64 14.8.2; magick.net-q16-hdri-openmp-x64 14.8.2; magick.net-q16-openmp-arm64 14.8.2; magick.net-q16-x64 14.8.2; magick.net-q8-x64 14.8.2; magick.net-q8-openmp-arm64 14.8.2; magick.net-q16-arm64 14.8.2; magick.net-q16-hdri-x64 14.8.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet magick.net-q8-arm64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-openmp-x64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-hdri-openmp-arm64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-hdri-arm64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q8-openmp-x64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-hdri-openmp-x64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-openmp-arm64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-x64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q8-x64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q8-openmp-arm64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-arm64: affected < 14.8.2; fixed in 14.8.2
- NuGet magick.net-q16-hdri-x64: affected < 14.8.2; fixed in 14.8.2

## Suggested inspection (read-only)
- NuGet magick.net-q8-arm64: check the installed version with your package manager.
- NuGet magick.net-q16-openmp-x64: check the installed version with your package manager.
- NuGet magick.net-q16-hdri-openmp-arm64: check the installed version with your package manager.
- NuGet magick.net-q16-hdri-arm64: check the installed version with your package manager.
- NuGet magick.net-q8-openmp-x64: check the installed version with your package manager.
- NuGet magick.net-q16-hdri-openmp-x64: check the installed version with your package manager.
- NuGet magick.net-q16-openmp-arm64: check the installed version with your package manager.
- NuGet magick.net-q16-x64: check the installed version with your package manager.
- NuGet magick.net-q8-x64: check the installed version with your package manager.
- NuGet magick.net-q8-openmp-arm64: check the installed version with your package manager.
- NuGet magick.net-q16-arm64: check the installed version with your package manager.
- NuGet magick.net-q16-hdri-x64: 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-arm64, magick.net-q16-openmp-x64, magick.net-q16-hdri-openmp-arm64, magick.net-q16-hdri-arm64, magick.net-q8-openmp-x64, magick.net-q16-hdri-openmp-x64, magick.net-q16-openmp-arm64, magick.net-q16-x64, magick.net-q8-x64, magick.net-q8-openmp-arm64, magick.net-q16-arm64, magick.net-q16-hdri-x64.
- 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-23hg-53q6-hqfg (GitHub-reviewed advisory GHSA-23hg-53q6-hqfg lists affected ranges: NuGet magick.net-q16-x64 >=0 =0 =0 =0 =0 =0 =0 =0 =0 =0 <14.8.2;…)

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