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CVE Record

CVE-2026-40244: OpenEXR has integer overflow in DWA setupChannelData planarUncRle pointer arithmetic (missed variant of CVE-2026-34589)

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, `internal_dwa_compressor.h:1722` performs `curc->width * curc->height` in `int32` arithmetic without a `(size_t)` cast. This is the same overflow pattern fixed in other locations by the recent CVE-2026-34589 batch, but this line was missed. Versions 3.4.10, 3.3.10, and 3.2.8 contain a fix that addresses `internal_dwa_compressor.h:1722`.

HighCVSS 8.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

OpenEXR can miscalculate memory offsets while handling certain DWA-compressed EXR images. A malicious file could affect confidentiality, integrity, and availability when opened or processed by vulnerable OpenEXR versions. The evidence names fixed versions, but does not show active exploitation.

Executive priority

Prioritize patching systems that process externally supplied media assets. The issue is high severity because file parsing can impact core security properties, but current evidence does not establish active exploitation.

Technical view

CVE-2026-40244 is a CWE-190 integer overflow in OpenEXR internal_dwa_compressor.h:1722. A multiplication of channel width and height occurs in int32 arithmetic before pointer use. It affects OpenEXR 3.2.0-3.2.7, 3.3.0-3.3.9, and 3.4.0-3.4.9.

Likely exposure

Exposure is most likely in media, rendering, image-processing, VFX, or asset-ingestion systems that parse EXR files with OpenEXR. Risk increases where users or automated pipelines process untrusted EXR uploads or third-party assets.

Exploitation context

The CVSS vector indicates local attack with user interaction and no privileges. The bundle marks KEV false and provides no cited evidence of active exploitation. Treat this as malicious-file processing risk, not confirmed internet-wide exploitation.

Researcher notes

This appears to be a missed variant of the CVE-2026-34589 integer-overflow fix pattern. Focus review on DWA channel setup, integer widening before multiplication, and downstream pointer arithmetic in fixed versus affected branches.

Mitigation direction

  • Upgrade OpenEXR to 3.2.8, 3.3.10, or 3.4.10 as appropriate.
  • Apply operating-system or vendor package updates when bundled OpenEXR is not directly managed.
  • Restrict processing of untrusted EXR files until patched.
  • Check upstream and distribution advisories for product-specific remediation guidance.

Validation and detection

  • Inventory applications, containers, and build dependencies that include OpenEXR.
  • Confirm deployed OpenEXR versions are outside the affected ranges.
  • Identify workflows that parse DWA-compressed EXR files from external sources.
  • Review vendor advisories for downstream package status and fixed builds.
Prepared
Confidence
high
Sources
9

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

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cwe · low confidence lookup

CWE-190: Exact CWE lookup

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cve · low confidence lookup

CVE-2026-40244 mapping review

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

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.4 (4.0)
Known Exploited
No
Published

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

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
8.4CVSS 4.0HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——GitHub_M
8.2CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H1.56redhat-SADP

Vulnerability scoring details

Base CVSS 4.0 score

8.4High
CVSS 4.0 vector shape for CVE-2026-40244Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
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-SADPOpenEXR: OpenEXR: Arbitrary code execution via integer overflow in EXR image processing
other:Red Hat severity ratingcvssV3_1
  • 2026-04-21T02:01:45.728Z: Reported to Red Hat.
  • 2026-04-21T01:30:55.061Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
AcademySoftwareFoundationopenexr>= 3.2.0, < 3.2.8, >= 3.3.0, < 3.3.10, >= 3.4.0, < 3.4.10Listed
Weakness

CWE details

CWE-190

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