Bug 2523735 (CVE-2026-65979)

Summary: CVE-2026-65979 OpenEXR: OpenEXR: Out-of-bounds read in HTJ2K decoder leads to denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenEXR's HTJ2K decoder. A local user could be tricked into opening a specially crafted EXR image file. When processed, the decoder reads beyond the bounds of an allocated buffer due to an unvalidated header length field. This out-of-bounds read can lead to a denial of service, making the application unavailable.
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Description OSIDB Bzimport 2026-08-25 19:19:30 UTC 
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the available buffer before using it. When decoding, it advances the codestream pointer by the attacker-supplied header size and passes the resulting offset and remaining length to the OpenJPH memory-input path, so a crafted value pushes the pointer past the end of the buffer and causes an out-of-bounds read. Because this field comes straight from attacker-controlled EXR chunk data, the flaw is reachable during normal decoding of an untrusted file. This issue is fixed in version 3.4.13.