Quick answers
- Is CVE-2026-59956 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-59956 being exploited in the wild.
- How severe is CVE-2026-59956?
- Medium severity, with a CVSS score of 6.1, published 18 September 2026.
- Which products and versions are affected?
- Academy Software Foundation OpenImageIO prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
- Is there a fix for CVE-2026-59956?
- A patch was published on 2026-06-27: Fix merged in commit f01bd16 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-59956 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-59956?
- Check whether you run Academy Software Foundation OpenImageIO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A buffer size mismatch in iffinput.cpp's readimg() function allocates a temporary scanline buffer based on rgba_count but copies data using pixel_bytes() stride, which includes z-buffer bytes for 16-bit uncompressed IFF images. This causes memcpy to read beyond the allocated buffer. The vulnerability requires opening a malicious IFF file and affects versions prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
Affected products
- Academy Software Foundation OpenImageIO prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1
Timeline
- 2026-09-18: disclosed: CVE-2026-59956 published
- 2026-06-27: patched: Fix merged in commit f01bd16