CVE-2025-12839

Code execution via unchecked EXR buffer copy

Published Dec 23, 2025 · Updated Dec 23, 2025

Heap-based buffer overflow in OpenEXR 3.4.0 allows remote attackers to execute code when a target opens a crafted EXR file. During EXR parsing, a copy operation trusts a user-supplied length and writes data into a heap buffer without checking the destination capacity. Exploitation requires user interaction through a malicious page or file and runs code with the privileges of the process that parses it.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in OpenEXR 3.4.0 allows remote attackers to execute code when a target opens a crafted EXR file. During EXR parsing, a copy operation trusts a user-supplied length and writes data into a heap buffer without checking the destination capacity. Exploitation requires user interaction through a malicious page or file and runs code with the privileges of the process that parses it.

The record

CVE
CVE-2025-12839
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-122, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.4.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=3.4.0

Published CVSS scores

7.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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