CVE-2026-26981
February 24, 2026
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the "istream_nonparallel_read" function in "ImfContextInit.cpp" when parsing a malformed EXR file through a memory-mapped "IStream". A signed integer subtraction produces a negative value that is implicitly converted to "size_t", resulting in a massive length being passed to "memcpy". Versions 3.3.7 and 3.4.5 contain a patch.
Affected Packages
https://github.com/AcademySoftwareFoundation/openexr.git (GITHUB):
Affected version(s) >=v3.3.0 <v3.3.7-rcFix Suggestion:
Update to version v3.3.7-rchttps://github.com/AcademySoftwareFoundation/openexr.git (GITHUB):
Affected version(s) >=v3.4.0 <v3.4.5-rcFix Suggestion:
Update to version v3.4.5-rcRelated Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Signed to Unsigned Conversion Error
EPSS
Base Score:
0.02
