CVE-2026-33900Network attack vector

Service crash via truncated VIFF packet allocation

Published Apr 13, 2026 · Updated Apr 13, 2026

Heap overflow in the ImageMagick VIFF encoder before 6.9.13-44 and before 7.1.2-19 allows remote attackers to crash image-processing services. WriteVIFFImage narrows its MagickSizeType packet count to size_t for heap allocation without first checking that the value is representable. Exploitation requires a 32-bit build and attacker-influenced image processing that produces an oversized packet count; the documented consequence is an availability-only crash.

CVSS severity5.9
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in the ImageMagick VIFF encoder before 6.9.13-44 and before 7.1.2-19 allows remote attackers to crash image-processing services. WriteVIFFImage narrows its MagickSizeType packet count to size_t for heap allocation without first checking that the value is representable. Exploitation requires a 32-bit build and attacker-influenced image processing that produces an oversized packet count; the documented consequence is an availability-only crash.

The record

CVE
CVE-2026-33900
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
ImageMagick Studio LLC
Product
ImageMagick
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.9.13-44
  2. Affected versionversion=< 7.1.2-19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ImageMagick Studio LLC · ImageMagickversion=< 6.9.13-44; version=< 7.1.2-19

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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