What is the CVSS score of CVE-2026-26981?

CVE-2026-26981 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Openexr are affected by CVE-2026-26981?

Organizations using versions 3.3.0 should be aware of notable risk from CVE-2026-26981 rated CVSS 6.5. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2026-26981?

Yes, a public proof-of-concept exploit is available for CVE-2026-26981. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26981?

Within 30 days: Identify affected systems running versions 3.3.0 and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Openexr CVE-2026-26981

EUVD-2026-7407 MEDIUM

Signed to Unsigned Conversion Error (CWE-195)

2026-02-24 security-advisories@github.com

GHSA-q6vj-wxvf-5m8c

Buffer Overflow Openexr Red Hat Suse

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

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

SUSE

MEDIUM

qualitative

Red Hat

6.5 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 12, 2026 - 21:55 euvd

EUVD-2026-7407

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 25, 2026 - 17:30 vuln.today

Public exploit code

Patch released

Feb 25, 2026 - 17:30 nvd

Patch available

CVE Published

Feb 24, 2026 - 03:16 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the istream_nonparallel_read function in ImfContextInit.cpp when parsing a malformed EXR file through a memory-mapped IStream. A signed integer subtraction produces a negative value that is implicitly converted to size_t, resulting in a massive length being passed to memcpy. Versions 3.3.7 and 3.4.5 contain a patch.

AnalysisAI

OpenEXR versions 3.3.0-3.3.6 and 3.4.0-3.4.4 are vulnerable to a heap buffer overflow in file parsing due to improper integer handling when processing malformed EXR files, allowing attackers to trigger a denial of service through memory-mapped streams. Public exploit code exists for this vulnerability. Patched versions 3.3.7 and 3.4.5 are available.

Technical ContextAI

Affects Openexr. OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the istream_nonparallel_read function in ImfContextInit.cpp when parsing a malformed EXR file through a memory-mapped IStream. A signed integer subtraction produces a negative value that is implicitly converted to size_t, resulting in a massive l

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

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