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CVE-2026-42216

Openexr out-of-bounds read

9.1 CRITICALPublic exploitEPSS 0.71%
  1. Published7 May 2026

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, IDManifest::init() reconstructs strings from a prefix-compressed representation. If the previous string is longer than 255 bytes, the next string is expected to begin with a 2-byte prefix length. The code reads stringList[i][0] and stringList[i][1] without checking that the current string has at least two bytes. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Openexr≥ 3.0.0 < 3.2.9 · ≥ 3.3.0 < 3.3.11 · ≥ 3.4.0 < 3.4.11

Remediation

Fixed in
Openexr≥ 3.2.9

References

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Frequently asked

Is CVE-2026-42216 being actively exploited?

CVE-2026-42216 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.71%.

How severe is CVE-2026-42216?

CVE-2026-42216 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.71% probability of exploitation.

Which products are affected by CVE-2026-42216?

Affected products include Openexr.

How do I fix CVE-2026-42216?

Upgrade affected software to a fixed version, for example Openexr 3.2.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42216 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.