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Review reviewHigh

CVE-2026-34379

AcademySoftwareFoundation openexr, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6

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, a misaligned memory write vulnerability exists in LossyDctDecoder_execute() in src/lib/OpenEXRCore/internal_dwa_decoder.h:749. When decoding a DWA or DWAB-compressed EXR file containing a FLOAT-type channel, the decoder performs an in-place HALF→FLOAT conversion by casting an unaligned uint8_t * row pointer to float * and writing through it. Because the row buffer may not be 4-byte aligned, this constit...

CVSS
7.1
EPSS
0.28%
20.6% percentile
CISA KEV
Not listed
Published
2026.04.07
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.28%
Technical severityCVSS 7.1

Vulnerability overview

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, a misaligned memory write vulnerability exists in LossyDctDecoder_execute() in src/lib/OpenEXRCore/internal_dwa_decoder.h:749. When decoding a DWA or DWAB-compressed EXR file containing a FLOAT-type channel, the decoder performs an in-place HALF→FLOAT conversion by casting an unaligned uint8_t * row pointer to float * and writing through it. Because the row buffer may not be 4-byte aligned, this constit...

Affected product and versions

Product
AcademySoftwareFoundation openexr, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6
Affected versions
>= >= 3.2.0, < 3.2.7, >= >= 3.3.0, < 3.3.9, >= >= 3.4.0, < 3.4.9, >= 3.2.0 < 3.2.7, >= 3.3.0 < 3.3.9, >= 3.4.0 < 3.4.9
Fixed versions
3.2.7, 3.3.9, 3.4.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that AcademySoftwareFoundation openexr, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE
CWE-475, CWE-704, CWE-787, CWE-843