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CVE Record

CVE-2026-34589: OpenEXR: DWA Lossy Decoder Heap Out-of-Bounds Write

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

OpenEXR versions in the listed 3.2, 3.3, and 3.4 ranges can corrupt memory while decoding specially formed DWA-compressed EXR images. Businesses using OpenEXR in rendering, media ingest, thumbnailing, or image processing should treat this as high priority because confidentiality, integrity, and availability impacts are rated high.

Executive priority

Prioritize remediation for systems processing external EXR files, especially production media pipelines and automated ingest services. The issue is high severity, but available sources do not show known active exploitation.

Technical view

The DWA lossy decoder uses signed 32-bit arithmetic for temporary per-component block pointers. Large image widths can overflow that calculation, causing later stores to write outside the allocated rowBlock buffer. Sources map this to CWE-190 and CWE-787, with CVSS 3.1 score 8.8.

Likely exposure

Exposure is most likely where applications, services, or desktop tools process untrusted or partner-supplied EXR files using OpenEXR 3.2.0-3.2.6, 3.3.0-3.3.8, or 3.4.0-3.4.8.

Exploitation context

The CVSS vector indicates network reachability with low attack complexity, no privileges, and required user interaction. The bundle marks KEV as false, and no provided source states active exploitation.

Researcher notes

Focus review on DWA lossy decode paths and large-width EXR handling. Evidence supports an integer overflow leading to heap out-of-bounds write, but the provided bundle does not include exploit details or downstream product impact beyond OpenEXR.

Mitigation direction

  • Upgrade OpenEXR to 3.2.7, 3.3.9, 3.4.9, or later supported fixed releases.
  • Identify statically linked or bundled OpenEXR copies inside media and rendering applications.
  • Rebuild and redeploy applications that embed affected OpenEXR libraries.
  • Check distro and vendor advisories for backported fixes and package-specific status.

Validation and detection

  • Inventory OpenEXR versions across packages, containers, build artifacts, and SBOMs.
  • Confirm no deployed component uses 3.2.0-3.2.6, 3.3.0-3.3.8, or 3.4.0-3.4.8.
  • Map workflows that accept EXR files from users, partners, queues, or network shares.
  • After remediation, verify runtime libraries resolve to a fixed OpenEXR version.
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

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-190: 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
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-2026-34589 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
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
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
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9redhat-SADP
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

Vulnerability scoring details

Base CVSS 4.0 score

8.4High
CVSS 4.0 vector shape for CVE-2026-34589Attack 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: Memory corruption leading to arbitrary code execution or denial of service
other:Red Hat severity ratingcvssV3_1
  • 2026-04-06T16:02:50.076Z: Reported to Red Hat.
  • 2026-04-06T15:33:03.276Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
AcademySoftwareFoundationopenexr>= 3.2.0, < 3.2.7, >= 3.3.0, < 3.3.9, >= 3.4.0, < 3.4.9Listed
Weakness

CWE details

CWE-190CWE-787

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

CWE-190 · source CWE mapping

Integer Overflow or Wraparound

Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-787 · source CWE mapping

Out-of-bounds Write

Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs