ImageMagick has a heap overflow caused by integer overflow/wraparound in viff encoder on 32-bit builds

CVE-2026-33900 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below both 7.1.2-19 and 6.9.13-44, the viff encoder contains an integer truncation/wraparound issue on 32-bit builds that could trigger an out of bounds heap write, potentially causing a crash. This issue has been fixed in versions 6.9.13-44 and 7.1.2-19.

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-04-13 19:09:58 UTC
Updated
2026-04-24 20:47:14 UTC
GitHub reviewed
2026-04-13 19:09:58 UTC
NVD published
2026-04-13

EPSS Score

Score Percentile
0.02% 4.94%

CVSS Scores

Base score Version Severity Vector
5.9 3.1 —
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H 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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-v67w-737x-v2c9 ↗
CVE CVE-2026-33900 ↗

CWEs

CWE id Name
CWE-190 Integer Overflow or Wraparound

Credits

  • shitianyu-2004 (reporter)

Affected packages (6)

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

Ecosystem Package Vulnerable range First patched Vulnerable functions
nuget Magick.NET-Q16-AnyCPU < 14.12.0 14.12.0 —
nuget Magick.NET-Q16-HDRI-AnyCPU < 14.12.0 14.12.0 —
nuget Magick.NET-Q16-HDRI-x86 < 14.12.0 14.12.0 —
nuget Magick.NET-Q16-x86 < 14.12.0 14.12.0 —
nuget Magick.NET-Q8-AnyCPU < 14.12.0 14.12.0 —
nuget Magick.NET-Q8-x86 < 14.12.0 14.12.0 —

References

cvelogic Threat Intelligence