CVE-2026-34379Public exploitNetwork attack vector

Application crashes via misaligned FLOAT-channel writes

Published Apr 6, 2026 · Updated Apr 6, 2026

Misaligned memory writes in OpenEXR allow remote attackers to crash decoding applications via crafted DWA or DWAB EXR files. LossyDctDecoder_execute casts a possibly unaligned row pointer to float * and writes an in-place HALF-to-FLOAT conversion without alignment padding. User interaction is required to decode the file; strict-alignment architectures crash reliably, while x86 behavior remains undefined and can corrupt output.

CVSS severity7.1
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Misaligned memory writes in OpenEXR allow remote attackers to crash decoding applications via crafted DWA or DWAB EXR files. LossyDctDecoder_execute casts a possibly unaligned row pointer to float * and writes an in-place HALF-to-FLOAT conversion without alignment padding. User interaction is required to decode the file; strict-alignment architectures crash reliably, while x86 behavior remains undefined and can corrupt output.

The record

CVE
CVE-2026-34379
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Academy Software Foundation
Product
OpenEXR
Classifications
CWE-475, CWE-704, CWE-787, CWE-843, T1203, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 3.2.0, < 3.2.7
  2. Affected versionversion=>= 3.3.0, < 3.3.9
  3. Affected versionversion=>= 3.4.0, < 3.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Academy Software Foundation · OpenEXRversion=>= 3.2.0, < 3.2.7; version=>= 3.3.0, < 3.3.9; version=>= 3.4.0, < 3.4.9

Published CVSS scores

7.1Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
7.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-475Undefined Behavior for Input to API
CWE-704Incorrect Type Conversion or Cast
CWE-787Out-of-bounds Write
CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1203Exploitation for Client Execution
T1204.002Malicious File

Public exploit references

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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