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TI-2026-42336 Aliases CVE-2026-59186

OpenEXR: Heap out-of-bounds write in TiledRgbaInputFile via integer overflow on 32-bit (ILP32) builds

Priority MEDIUM 64CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can trigger a heap out-of-bounds write on 32-bit/ILP32 builds when read through the public TiledRgbaInputFile RGBA API. The file uses a small 40x40 dataWindow but a 65537x65537 tile size. On ILP32, the Array2D<Rgba> tile-conversion buffer size calculation overflows, allocates a much smaller heap buffer, and tile decode writes past that allocation. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00272 19th percentileScored 2026-11-07
Fix Fixed openexr (AcademySoftwareFoundation): 3.2.11, 3.3.13, 3.4.14Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AcademySoftwareFoundationopenexrbefore 3.2.11; 3.3.0 to before 3.3.13; 3.4.0 to before 3.4.143.2.11, 3.3.13, 3.4.14Patch availableCNA
  • openexr VendorAcademySoftwareFoundation Affected before 3.2.11; 3.3.0 to before 3.3.13; 3.4.0 to before 3.4.14 Fixed in 3.2.11, 3.3.13, 3.4.14 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*——Academy Software Foundation

Remediation

  • Fix · CNA openexr (AcademySoftwareFoundation) Fixed in 3.2.11, 3.3.13, 3.4.14

Red Hat 1 advisory

  • RHSA-2026:82345 Released 2026-10-13 · Red Hat rating Important
    OpenEXR security update
    • Red Hat Enterprise Linux AppStream (v. 8) OpenEXR-2.2.0-12.el8_10.3, OpenEXR-libs-2.2.0-12.el8_10.3
    • Red Hat Enterprise Linux CRB (v. 8) OpenEXR-devel-2.2.0-12.el8_10.3

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:82345
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:82345
Not affected: 4 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59186
  2. 2026-10-14 Fix available: RHSA-2026:82345 · Red Hat
  3. 2026-10-15 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat

References

Other 4

  • TI-2026-30739 OpenColorIO vulnerable to stack buffer overflow via unbounded `sscanf %s` in Spi3D (.spi3d) LUT parser CVSS 4.0HIGH 8.4
  • TI-2026-38605 OpenEXR: Unhandled assert abort in HTJ2K decoder via crafted QCD marker (DoS) CVSS 4.0HIGH 7.1
  • TI-2026-48281 OpenEXR: Heap out-of-bounds write in exrmultiview with subsampled channel union CVSS 3.1HIGH 7.1
  • TI-2026-48279 OpenEXR: Heap buffer overflow in PyOpenEXR from literal/prefixed RGB channel name collision CVSS 3.1HIGH 7.1
  • TI-2026-42768 OpenEXR: Heap OOB read in SampleCountChannel row when using nonzero dataWindow CVSS 3.1HIGH 7.1
  • TI-2026-42338 OpenEXR: Out-of-bounds read in DeepImageChannel::row() for non-zero dataWindow origin CVSS 3.1HIGH 7.1
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences