CVE-2026-42217 OpenEXR: Shift exponent overflow in `readVariableLengthInteger()` (`ImfIDManifest.cpp`)
An attacker can cause a denial of service by providing a crafted EXR file that triggers undefined behavior via an unbounded shift in the OpenEXR library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42217?
CVE-2026-42217 is a medium-severity vulnerability in Openexr Openexr, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, readVariableLengthInteger() decodes a variable-length integer from untrusted EXR input without bounding the shift count. After enough continuation bytes, the code executes a left shift by 70 on a 64-bit value, which is undefined behavior. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.
Weakness: CWE-190
Which versions are affected by CVE-2026-42217?
It affects 1 product.
Products include Openexr Openexr.
How do I fix CVE-2026-42217?
Upgrade to a fixed version.
Is CVE-2026-42217 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42217 exists.
Other vulnerabilities in Openexr Openexr
- CVE-2023-5841 OpenEXR Heap Overflow in Scanline Deep Data Parsing
- CVE-2026-41142 OpenEXR is Vulnerable to Integer overflow in ImageChannel::resize leads to heap OOB write via OpenEXRUtil public API
- CVE-2026-42216 OpenEXR: Out-of-bounds read in `IDManifest::init()` during prefix expansion
- CVE-2017-9111 OpenEXR invalid write
- CVE-2017-9113 Memory corruption in n/a
Sources
Also known as BELL-CVE-2026-42217, DEBIAN-CVE-2026-42217, ECHO-e186-1aab-8c05, GHSA-3c67-4wwp-w52m, JLSEC-2026-811, ROOT-OS-DEBIAN-11-CVE-2026-42217 and 3 more.