CVE-2026-62986
OpenEXR is the reference implementation and specification for the EXR image file format, widely used in the motion picture industry. In versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13, the PyOpenEXR Python bindings return stale heap data when reading a crafted deep scanline EXR that uses layer-prefixed RGB channels. With the default channel coalescing (separate_channels=False), the wrapper groups channels such as left.R, left.G, and left.B into a single RGB sample array, but the lane-offset calculation in PyPart::setDeepSliceData() only recognizes the exact unprefixed names G, B, and A. As a result, prefixed channels like left.G and left.B are decoded into lane 0 while lanes 1 and 2 are left uninitialized and returned to Python. A Python application that reads untrusted deep EXR files through the default OpenEXR.File API and then logs, serializes, previews, or otherwise processes the resulting NumPy sample arrays may expose uninitialized same-process heap contents, in addition to receiving incorrect green and blue channel data. This issue is fixed in versions 3.3.13 and 3.4.14.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4.3
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- EPSS probability
- 0.23%
- CWE
- CWE-200, CWE-457, CWE-908
- Published
- 2026-08-25
- Last modified
- 2026-08-25
Affected products
- AcademySoftwareFoundation openexr
- AcademySoftwareFoundation openexr
Weakness type
Related vulnerabilities
- CVE-2026-88059 — Angular: Information Leak via `HttpTransferCache` Bypass When Using `withRequestsMadeViaParent`
- CVE-2026-88013 — rclone: http backend forwards custom/auth headers to a different host on redirect
- CVE-2026-88893 — OpenPanel Unauthenticated Share Lookup Information Disclosure
- CVE-2026-88876 — AVideo PlayerSkins seo.php Missing Authorization Password-Protected VOD
- CVE-2026-88874 — AVideo through c3edcc274c389816d434acadac07ee78eaf330c1 Authentication Bypass
- CVE-2026-0305 — Prisma Access Agent: Information Disclosure Vulnerability on Linux
- CVE-2026-87017 — Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool on most vector backends
- CVE-2026-86767 — Snipe-IT before 8.7.0 Cross-Company Read via requested-assets