Bug 2444251 (CVE-2026-27622)

Summary:	CVE-2026-27622 openexr: OpenEXR: Arbitrary code execution via integer overflow in EXR file processing
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in OpenEXR, an image storage format library for the motion picture industry. An attacker can craft a malicious EXR file that, when processed, causes an integer overflow in the `CompositeDeepScanLine::readPixels` function. This overflow leads to an undersized buffer allocation, which can then be overrun during write operations. Successful exploitation could result in arbitrary code execution or a denial of service (DoS).	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2444289, 2444290, 2444291, 2444292
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Description OSIDB Bzimport 2026-03-03 23:02:50 UTC

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.