CVE-2021-26945

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0...

5.5 MediumFix available

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.67%Up 0.3 points since Jun 9, 2021

What each source reports

NVD Score used 5.5

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: CVE-2021-26945
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-400, CWE-190
Updated: 2026-11-02

CVE List No score

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: CVE-2021-26945
Weakness: CWE-400
Updated: 2026-11-02

EUVDEUVD-2021-13727 No score

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: EUVD-2021-13727
Updated: 2026-11-03

GitHub AdvisoriesGHSA-h5g9-4xw7-698r 5.5

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0...

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: GHSA-h5g9-4xw7-698r
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-190, CWE-191, CWE-400
Updated: 2026-11-02

OSVALPINE-CVE-2021-26945 5.5

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: ALPINE-CVE-2021-26945
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-03

OSVAZL-45207 5.5

CVE-2021-26945 affecting package OpenEXR 2.3.0-6

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: AZL-45207
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-05

OSV 5.5

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: CVE-2021-26945
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-26945 5.5

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: DEBIAN-CVE-2021-26945
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-26945 5.5

An integer overflow leading to a heap-buffer overflow was found in OpenEXR in versions before 3.0.1. An attacker could use this flaw to crash an application compiled with OpenEXR.

Record: UBUNTU-CVE-2021-26945
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`openexr` Alpine:v3.15	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.16	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.17	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.18	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.19	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.20	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.21	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.22	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.23	before 3.1.1-r0	3.1.1-r0
`openexr` Alpine:v3.24	before 3.1.1-r0	3.1.1-r0

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Affected packages
Package	Affected	Fixed
`OpenEXR` Azure Linux:3	through 2.3.0-6	None known
`openexr` Debian:12	before 3.1.5-2	3.1.5-2
`openexr` Debian:13	before 3.1.5-2	3.1.5-2
`openexr` Debian:14	before 3.1.5-2	3.1.5-2
`openexr` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 2.2.1-4.1ubuntu12.3.0-62.3.0-6build12.3.0-6ubuntu0.12.3.0-6ubuntu0.2 Show 4 moreShow less 2.3.0-6ubuntu0.32.3.0-6ubuntu0.52.3.0-6ubuntu0.5+esm12.3.0-6ubuntu0.5+esm2	None known
`openexr` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 2.5.4-22.5.7-12.5.7-1ubuntu0.1~esm12.5.7-1ubuntu0.1~esm2	None known
`openexr` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 3.1.5-5.13.1.5-5.1build13.1.5-5.1build23.1.5-5.1build33.1.5-5.1ubuntu0.1~esm1	None known
`openexr` Ubuntu:25.10	All versions, plus listed versions 3.1.13-2	None known
`openexr` Ubuntu:26.10	All versions, plus listed versions 3.1.13-2build13.4.6+ds-4ubuntu3	None known
`openexr` Ubuntu:Pro:26.04:LTS	All versions, plus listed versions 3.1.13-23.1.13-2build13.1.13-2ubuntu0.26.04.1~esm1	None known

History

History
Recorded	Changed	Sources
Nov 5, 2026	facts	OSV
Nov 3, 2026	affected, aliases, references	OSV
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26945 is a medium vulnerability (CVSS 5.5) in Academysoftwarefoundation Openexr, published June 8, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.67%, the 52nd percentile. Fixed in openexr 3.1.1-r0.

Attack profile

How easy it is to exploit

What an attacker can affect

Exploit likelihood

What each source reports

Affected products

Affected packages

History

In short

References