OpenEXR: Out-of-bounds read in HTJ2K decoder from unvalidated chunk header length (PLEN)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-65979
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-25 19:16:52 UTC
Updated2026-08-25 20:17:01 UTC
DescriptionOpenEXR 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.

Risk And Classification

Primary CVSS: v4.0 6.7 MEDIUM from [email protected]

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-20 | CWE-125 | CWE-20 CWE-20: Improper Input Validation | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.7MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED6.7MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Active
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA AcademySoftwareFoundation Openexr affected >= 3.4.0, < 3.4.13 Not specified

References

ReferenceSourceLinkTags
github.com/AcademySoftwareFoundation/openexr/commit/c7af2d233b7b2a4452c1... [email protected] github.com
github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3j... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.13 [email protected] github.com
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