ImageMagick has Global Buffer Overflow (OOB Read) via Negative Pixel Index in UIL and XPM Writer

CVE-2026-25898 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

The UIL and XPM image encoder do not validate the pixel index value returned by GetPixelIndex() before using it as an array subscript. In HDRI builds, Quantum is a floating-point type, so pixel index values can be negative. An attacker can craft an image with negative pixel index values to trigger a global buffer overflow read during conversion, leading to information disclosure or a process crash.

READ of size 1 at 0x55a8823a776e thread T0
    #0 0x55a880d01e85 in WriteUILImage coders/uil.c:355

READ of size 1 at 0x55fa1c04c66e thread T0
    #0 0x55fa1a9ee415 in WriteXPMImage coders/xpm.c:1135

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-02-24 15:39:11 UTC
Updated
2026-02-24 15:39:16 UTC
GitHub reviewed
2026-02-24 15:39:11 UTC
NVD published
2026-02-23

EPSS Score

Score Percentile
0.02% 5.54%

CVSS Scores

Base score Version Severity Vector
6.5 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.

Identifiers

Type Value
GHSA GHSA-vpxv-r9pg-7gpr ↗
CVE CVE-2026-25898 ↗

CWEs

CWE id Name
CWE-125 Out-of-bounds Read

Credits

  • ylwango613 (reporter)

Affected packages (17)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
nuget Magick.NET-Q16-AnyCPU < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-HDRI-AnyCPU < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-HDRI-OpenMP-arm64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-HDRI-OpenMP-x64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-HDRI-arm64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-HDRI-x64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-OpenMP-arm64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-OpenMP-x64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-OpenMP-x86 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-arm64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-x64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q16-x86 < 14.10.3 14.10.3 —
nuget Magick.NET-Q8-AnyCPU < 14.10.3 14.10.3 —
nuget Magick.NET-Q8-OpenMP-arm64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q8-OpenMP-x64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q8-arm64 < 14.10.3 14.10.3 —
nuget Magick.NET-Q8-x86 < 14.10.3 14.10.3 —

References

cvelogic Threat Intelligence