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OpenEXR CVE-2026-45696

| EUVDEUVD-2026-37948 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-06-18 GitHub_M
Heap Overflow Buffer Overflow Openexr
8.3
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.3 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.1 HIGH

Attacker-supplied EXR reaches the decoder over network-delivered content but requires a user/service to open the file (UI:R); no auth on the library itself (PR:N); 4-byte over-read gives low confidentiality and high availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
6.1 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Red Hat
7.1 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jun 18, 2026 - 23:16 EUVD
Source Code Evidence Fetched
Jun 18, 2026 - 21:53 vuln.today
Analysis Generated
Jun 18, 2026 - 21:53 vuln.today

DescriptionCVE.org

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, the HTJ2K (High-Throughput JPEG 2000) decoder, ht_undo_impl() in OpenEXRCore is vulnerable to a heap-buffer-overflow READ. The ht_undo_imp function copies decoded pixels out of a per-line OpenJPH buffer using the EXR channel's declared width as the iteration count. The codestream embedded in the EXR chunk can declare different (smaller) tile/line dimensions than the EXR header advertises, but ht_undo_impl() does not validate this - it pulls width 32-bit samples from cur_line->i32[] without checking the OpenJPH line buffer's actual length. A crafted EXR file produces a 4-byte heap-buffer-overflow READ immediately after a buffer allocated by ojph::local::codestream::finalize_alloc(). The bug is reachable through the standard scanline-decode entry point used by every consumer of exr_decoding_run/Imf::checkOpenEXRFile, including thumbnailers, asset pipelines, and the exrcheck utility - i.e. any application that opens untrusted EXR files. The result is a deterministic crash (DoS) and potential adjacent-heap leak. This issue has been fixed in version 3.4.12.

AnalysisAI

Heap-buffer-overflow READ in OpenEXR 3.4.0 through 3.4.11 occurs in the HTJ2K decoder's ht_undo_impl() function when processing a crafted EXR file with mismatched codestream and channel widths, producing a deterministic crash and potential adjacent-heap memory disclosure. Any application that opens untrusted EXR files - including thumbnailers, asset pipelines, and the exrcheck utility - is reachable via the standard scanline-decode entry point. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft EXR with HTJ2K width mismatch
Delivery
Deliver file to OpenEXR consumer
Exploit
Application calls exr_decoding_run
Execution
ht_undo_impl reads past OpenJPH line buffer
Impact
Process crashes or leaks adjacent heap bytes
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Vulnerability AssessmentAI

Exploitation Requires the target application to invoke OpenEXR's standard scanline-decode entry point (exr_decoding_run or Imf::checkOpenEXRFile) on an attacker-supplied EXR file that uses HTJ2K compression and embeds a JPEG 2000 codestream whose declared tile/line width is smaller than the EXR header's channel width. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H) emphasizes availability impact with no confidentiality or integrity loss in the vulnerable system, which matches a deterministic crash bug; the SA:H reflects that downstream services parsing user-supplied EXRs (render farms, thumbnail services, asset ingestion) can be taken offline. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker uploads a crafted EXR file to a service that automatically thumbnails or ingests image assets - for example a media-asset web app, a render-farm submission queue, or a desktop file-manager preview pane. When the worker calls exr_decoding_run or Imf::checkOpenEXRFile on the file, ht_undo_impl() reads 4 bytes past the OpenJPH line buffer, crashing the process and potentially leaking adjacent heap contents into error logs or telemetry. …
Remediation Vendor-released patch: OpenEXR 3.4.12, published at https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12, which also addresses CVE-2026-44663 and several OSS-Fuzz findings in the same HTJ2K and DWA decoders. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all systems running OpenEXR 3.4.0-3.4.11 and assess exposure of untrusted EXR file ingestion (asset pipelines, thumbnailers, cloud services). …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Not-Affected

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CVE-2026-45696 vulnerability details – vuln.today
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