CVE-2026-34378

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Source
https://cve.org/CVERecord?id=CVE-2026-34378
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34378.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34378
Aliases
  • GHSA-v76p-4qvv-vh4g
Downstream
Related
Published
2026-04-06T15:19:34.871Z
Modified
2026-07-15T01:49:15.843720715Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
OpenEXR has a signed integer overflow in generic_unpack() when parsing EXR files with crafted negative dataWindow.min.x
Details

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34378.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-190"
    ]
}
References

Affected packages

Git / github.com/academysoftwarefoundation/openexr

Affected ranges

Type
GIT
Repo
https://github.com/academysoftwarefoundation/openexr
Events
Introduced
20a65852895894434bea88613f6d29ac8e88bd6e
Fixed
b5fa98ac6b5fc660c0295123c1d02bbf687dbec3
Database specific 
{
    "cpe": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "3.4.0"
        },
        {
            "fixed": "3.4.9"
        }
    ]
}

Affected versions

v3.*
v3.4.0
v3.4.1
v3.4.1-rc
v3.4.1-rc2
v3.4.2
v3.4.2-rc
v3.4.2-rc2
v3.4.3
v3.4.3-rc
v3.4.3-rc2
v3.4.3-rc3
v3.4.4
v3.4.4-rc
v3.4.4-rc2
v3.4.5
v3.4.5-rc
v3.4.6
v3.4.6-rc
v3.4.7
v3.4.7-rc
v3.4.8
v3.4.8-rc
v3.4.9-rc

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34378.json"