SB2026040873 - Signed to Unsigned Conversion Error in OpenEXR
Published: April 8, 2026
Security Bulletin ID
SB2026040873
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Signed to Unsigned Conversion Error (CVE-ID: CVE-2026-26981)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to signed to unsigned conversion error in the istream_nonparallel_read function in ImfContextInit.cpp when parsing a malformed EXR file through a memory-mapped IStream. A remote attacker can supply a specially crafted EXR file to cause a denial of service.
User interaction is required to open the crafted file. Only applications using an IStream implementation where isMemoryMapped() returns true are vulnerable.
Remediation
Install update from vendor's website.