CVE-2026-44663

Description

Cary Phillips reports: [The OpenEXR 3.4.12] release addresses the following security vulnerabilities:

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-44663 on 2026-07-06. Shown when MITRE's text differs from the cvelistV5 mirror.

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, an integer overflow in ht_undo_impl() in src/lib/OpenEXRCore/internal_ht.cpp leads to a heap-buffer overflow when decoding a crafted HTJ2K-compressed EXR file. decode->channels[i].width (int32_t) is multiplied by bytes_per_element in 32-bit signed arithmetic. With large widths (e.g., >= 536870912 for FLOAT data), this overflows, producing a corrupted offset that is later used for pointer arithmetic and can cause a heap out-of-bounds write. The same unchecked multiplication pattern appears in two other HTJ2K paths (bytes-per-line accumulation and pixel-line pointer advancement). As with related CVE-2026-34378 through CVE-2026-34589 fixes in other codecs, validating only after the multiplication is too late because the value may already be overflowed. This issue has been fixed in version 3.4.12.

Overview

State

—

Assigner (CNA)

—

CVSS severity

critical

CVSS score

9.1 / 10

CVSS vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Effective score

9.1 / 10 CRITICAL source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2026-44663

Linked Threat

CVE-2026-44663 — CVE-2026-44663

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2026-06-18 21:16:28 UTC

NVD last modified

2026-06-26 02:20:43 UTC

NVD CVSS v3.1

6.1 / 10 MEDIUM source: security-advisories@github.com

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Exploitability subscore

1.8 / 10

Impact subscore

4.2 / 10

EPSS score

0.0020 (probability of exploitation in next 30 days)

EPSS percentile

9.89% vs all CVEs — higher = more likely to be exploited, as of 2026-07-05

NVD-assigned CWE(s): CWE-190, CWE-787 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-37944

Assigner

GitHub_M

Published

Jun 18, 2026, 8:20:15 PM

Updated

Jun 22, 2026, 3:47:32 PM

EUVD base score (CVSS 3.1)

6.1 / 10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

EUVD-reported EPSS

0.2000

Vendors

AcademySoftwareFoundation

Products

OpenEXR (3.4.0, < 3.4.11)

ENISA description: 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, an integer overflow in ht_undo_impl() in src/lib/OpenEXRCore/internal_ht.cpp leads to a heap-buffer overflow when decoding a crafted HTJ2K-compressed EXR file. decode->channels[i].width (int32_t) is multiplied by bytes_per_element in 32-bit signed arithmetic. With large widths (e.g., >= 536870912 for FLOAT data), this overflows, producing a corrupted offset that is later used for pointer arithmetic and can cause a heap out-of-bounds write. The same unchecked multiplication pattern appears in two other HTJ2K paths (bytes-per-line accumulation and pixel-line pointer advancement). As with related CVE-2026-34378 through CVE-2026-34589 fixes in other codecs, validating only after the multiplication is too late because the value may already be overflowed. This issue has been fixed in version 3.4.12.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

MITRE references (2) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12 x_refsource_MISC
• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-777r-f9x8-7r84 x_refsource_CONFIRM

Web references (2)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://nvd.nist.gov/vuln/detail/CVE-2026-44663 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-44663 tenable:www.cve.org

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

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