Integer overflow in OpenEXR
Priority LOW 37CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Deferred Red Hat: fix deferred
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.
Summary
A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.
Why it matters now
EPSS 0.02067 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Deferred Red Hat: fix deferred
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | OpenEXR | Fixed in OpenEXR 3.0.0-beta | — | No fix listed | CNA |
- OpenEXR Vendor— Affected Fixed in OpenEXR 3.0.0-beta Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* | up to 2.5.7 | Vulnerable | Academy Software Foundation |
- cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:* Versions up to 2.5.7 Vulnerable ·Academy Software Foundation
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20304
- 2026-10-03 Alias added: GHSA-m48r-2qrf-q5hh
References
Patch 2
More Academy Software Foundation Openexr vulnerabilities
- TI-2023-05377 OpenEXR Heap Overflow in Scanline Deep Data Parsing CVSS 3.1CRITICAL 9.1
- TI-2026-30537 OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion CVSS 4.0HIGH 8.8
- TI-2026-26792 OpenEXR: Heap information disclosure in PXR24 decompression via unchecked decompressed size (undo_pxr24_impl) CVSS 4.0HIGH 8.7
- TI-2026-26794 OpenEXR: integer overflow lead to OOB in HTJ2K decoder CVSS 4.0HIGH 8.4
- TI-2026-26793 OpenEXR: integer overflow to OOB write in uncompress_b44_impl() CVSS 4.0HIGH 8.4
- TI-2025-30442 OpenEXR's Forged Unpacked Size can Lead to Heap-Based Buffer Overflow in Deep Scanline Parsing CVSS 4.0HIGH 8.4
Sources
- CVE-2021-20304 · CVE Program
- CVE-2021-20304 · NVD
- FIRST EPSS
- GHSA-m48r-2qrf-q5hh · GitHub Advisory Database · CC BY 4.0
- CVE-2021-20304 · Red Hat security data · CC BY 4.0
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