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CVE-2026-27622

Openexr buffer overflow

7.8 HIGHPublic exploitEPSS 0.22%
  1. Published3 Mar 2026

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In CompositeDeepScanLine::readPixels, per-pixel totals are accumulated in vector<unsigned int> total_sizes for attacker-controlled large counts across many parts, total_sizes[ptr] wraps modulo 2^32. overall_sample_count is then derived from wrapped totals and used in samples[channel].resize(overall_sample_count). Decode pointer setup/consumption proceeds with true sample counts, and write operations in core unpack (generic_unpack_deep_pointers) overrun the undersized composite sample buffer. This vulnerability is fixed in v3.2.6, v3.3.8, and v3.4.6.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Openexr≥ 3.3.0 < 3.3.8 · ≥ 3.4.0 < 3.4.6 · < 3.2.6

Remediation

Fixed in
Openexr≥ 3.3.8

References

and 10 more references

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Frequently asked

Is CVE-2026-27622 being actively exploited?

CVE-2026-27622 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.22%.

How severe is CVE-2026-27622?

CVE-2026-27622 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.22% probability of exploitation.

Which products are affected by CVE-2026-27622?

Affected products include Openexr.

How do I fix CVE-2026-27622?

Upgrade affected software to a fixed version, for example Openexr 3.3.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27622 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.