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CVE Record

CVE-2026-33901: ImageMagick has a Heap Buffer Overflow via MVG decoder

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, a heap buffer overflow occurs in the MVG decoder that could result in an out of bounds write when processing a crafted image. This issue has been fixed in versions 6.9.13-44 and 7.1.2-19.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-33901 is a high-severity ImageMagick flaw. A crafted image handled by vulnerable versions can trigger memory corruption in the MVG decoder and may crash image-processing services. The supplied sources name fixed versions but do not show active exploitation.

Executive priority

Prioritize remediation for internet-facing or partner-facing systems that accept image uploads. The main confirmed impact is service availability, so systems supporting customer onboarding, document intake, or media processing should be patched promptly.

Technical view

ImageMagick versions below 7.1.2-19 and 6.9.13-44 contain a heap buffer overflow in MVG decoding, causing an out-of-bounds write when processing a crafted image. CVSS 3.1 is 7.5 with network, low-complexity, unauthenticated, no-user-interaction availability impact.

Likely exposure

Exposure is most likely in web applications, APIs, batch pipelines, or content management systems that process untrusted images using vulnerable ImageMagick builds. Confirm both ImageMagick 7.x and legacy 6.x deployments, including containers and packaged operating-system builds.

Exploitation context

The provided data does not indicate CISA KEV status or active exploitation. The risk is credible because the bug is unauthenticated, low complexity, and reachable where remote users can submit images for server-side processing.

Researcher notes

The record maps to CWE-122 and CWE-787. The CVSS vector reports no confidentiality or integrity impact, but high availability impact. Sources identify the vulnerable component and fixed releases; they do not provide evidence of exploitation in the supplied bundle.

Mitigation direction

  • Upgrade ImageMagick 7.x to 7.1.2-19 or later.
  • Upgrade ImageMagick 6.x to 6.9.13-44 or later.
  • Update containers, base images, and distribution packages that include ImageMagick.
  • Review vendor and distribution advisories for any additional hardening guidance.
  • Limit untrusted image processing paths until fixed versions are deployed.

Validation and detection

  • Inventory ImageMagick versions across hosts, containers, and build images.
  • Identify services that process user-supplied images server-side.
  • Confirm production runtimes report 7.1.2-19, 6.9.13-44, or later.
  • Check dependency and OS package advisories for backported fixes.
  • Review image-processing error logs for unusual crashes or malformed-image activity.
Prepared
Confidence
high
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-122: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cwe · low confidence lookup

CWE-787: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-33901 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
7Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6GitHub_M
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-33901Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPImageMagick: Magick.NET: ImageMagick: Denial of Service due to heap buffer overflow in MVG decoder
other:Red Hat severity ratingcvssV3_1
  • 2026-04-13T21:01:21.442Z: Reported to Red Hat.
  • 2026-04-13T20:56:12.307Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
ImageMagickImageMagick< 7.1.2-19, < 6.9.13-44Listed
Weakness

CWE details

CWE-122CWE-787

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.