Python Library OpenEXR 2.3.x / 3.x < 3.2.6 / 3.3.x < 3.3.8 / 3.4.x < 3.4.6 Heap Buffer Overflow

high Nessus Plugin ID 301138

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Synopsis

A Python library installed on the remote host is affected by a heap buffer overflow vulnerability.

Description

The version of the OpenEXR Python package installed on the remote host is 2.3.x or 3.x prior to 3.2.6, 3.3.x prior to 3.3.8, or 3.4.x prior to 3.4.6. It is, therefore, affected by a heap buffer overflow vulnerability:

- In CompositeDeepScanLine::readPixels, per-pixel totals are accumulated in a vector of unsigned int values for attacker-controlled large counts across many parts. The totals wrap modulo 2^32, causing an undersized composite sample buffer allocation. Subsequent decode operations overrun this buffer. (CVE-2026-27622)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to OpenEXR version 3.2.6, 3.3.8, 3.4.6 or later.

Plugin Details

Severity: High

ID: 301138

File Name: python_openexr_CVE-2026-27622.nasl

Version: 1.1

Type: local

Agent: windows, macosx, unix

Family: Misc.

Published: 3/6/2026

Updated: 3/6/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-27622

CVSS v3

Risk Factor: High

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:academysoftwarefoundation:openexr

Patch Publication Date: 3/2/2026

Vulnerability Publication Date: 3/2/2026

Reference Information

CVE: CVE-2026-27622

IAVA: 2026-A-0206

Detections

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