Integer overflow in OpenEXR - CVE-2026-39886
Published: April 20, 2026
Vulnerability identifier: #VU126524
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-39886
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenEXR
Affected software:
OpenEXR
OpenEXR
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to signed integer overflow in ht_undo_impl() in src/lib/OpenEXRCore/internal_ht.cpp when processing a crafted HTJ2K-compressed EXR file. A remote attacker can supply a specially crafted EXR file to cause a denial of service.
On allocator-permissive hosts, the wrapped negative bytes-per-line value may be used as a per-scanline pointer advance, which could lead to a heap out-of-bounds write.
How to mitigate CVE-2026-39886
Install security update from vendor's website.