CVE-2026-27622

OpenEXR CompositeDeepScanLine integer-overflow leads to heap OOB write

HIGH

7.8

CVSS Score

Published: March 3, 2026 at 10:42 PM UTC

Updated: July 15, 2026 at 02:19 AM UTC

2 products affected across 2 vendorsOpenexrOpenexr

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Openexr · Openexr

95%

v < 3.2.63.3.0 ≤ v < 3.3.83.4.0 ≤ v < 3.4.6

Affected range stops below 3.2.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.3.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.4.6, so it looks safe — our inference, not a vendor statement

Openexr · Academysoftwarefoundation

60%

v < 3.2.6v < 3.3.8v < 3.4.6

Affected range stops below 3.2.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.3.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.4.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-cr4v-6jm6-4963