Medium
openimageio — security advisory
OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, An uncompressed 16-bit iff image with a z-buffer makes iffinput::readimg() allocate a temporary scanline from m_header.rgba_count but copy from it using m_header.pixel_bytes(), whose stride also includes z-buffer bytes. the oversized memcpy reads beyond the temporary heap buffer and copies adjacent memory into the output image, resulting in a crash or disclosure of adjacent heap data. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::readimg(), m_header.rgba_count, and m_header.pixel_bytes(), which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
- Products
- openimageio
- Affected versions
- 1.5.17~dfsg0-1ubuntu2, 1.5.20~dfsg0-1ubuntu2, 1.5.23~dfsg0-1ubuntu1, 1.6.10~dfsg0-1ubuntu1, 1.6.10~dfsg0-2ubuntu1, 1.6.11~dfsg0-1ubuntu1, 1.6.11~dfsg0-1ubuntu1+esm2, 1.6.17~dfsg0-1ubuntu5, 1.6.9~dfsg0-4ubuntu1, 1.7.17~dfsg0-1ubuntu2, 1.7.17~dfsg0-1ubuntu2+esm1, 2.0.10~dfsg0-1, 2.0.11~dfsg0-1, 2.0.12~dfsg0-1, 2.0.12~dfsg0-1build1, 2.0.12~dfsg0-1build2, 2.1.10.1~dfsg0-5ubuntu4, 2.1.10.1~dfsg0-5ubuntu5, 2.1.12.0~dfsg0-1, 2.1.12.0~dfsg0-1ubuntu0.1~esm1, 2.2.10.1+dfsg-1build1, 2.2.18.0+dfsg-1, 2.2.18.0+dfsg-1build2, 2.2.18.0+dfsg-1ubuntu2, 2.4.14.0+dfsg-1, 2.4.16.0+dfsg-1, 2.4.16.0+dfsg-1build1, 2.4.17.0+dfsg-1, 2.4.17.0+dfsg-1.1build3, 2.4.17.0+dfsg-1.1build4, 2.4.17.0+dfsg-1.1ubuntu0.1~esm1, 2.4.17.0+dfsg-1build1, 2.5.18.0+dfsg-1build2, 2.5.19.1+dfsg-1build1, 2.5.19.1+dfsg-1build3, 2.5.19.1+dfsg-1build5, 2.5.19.1+dfsg-2, 2.5.19.1+dfsg-2build1, 2.5.19.1+dfsg-2build2, 2.5.19.1+dfsg-2ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-59956
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:43 UTC · Revision 1
Source evidence
OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, An uncompressed 16-bit iff image with a z-buffer makes iffinput::readimg() allocate a temporary scanline from m_header.rgba_count but copy from it using m_header.pixel_bytes(), whose stride also includes z-buffer bytes. the oversized memcpy reads beyond the temporary heap buffer and copies adjacent memory into the output image, resulting in a crash or disclosure of adjacent heap data. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::readimg(), m_header.rgba_count, and m_header.pixel_bytes(), which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
osv:UBUNTU-CVE-2026-59956
openimageio
Fixed versions: Not specified
openimageio
Fixed versions: Not specified
openimageio
Fixed versions: Not specified
openimageio
Fixed versions: Not specified
openimageio
Fixed versions: Not specified
openimageio
Fixed versions: Not specified
openimageio
Fixed versions: Not specified
Complete source record
{
"id": "9717350252251850dbe047e3b80d02cb8f84e22ea086aba9154d7f0391b150e9",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-59956",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-59956",
"summary": "OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, An uncompressed 16-bit iff image with a z-buffer makes iffinput::readimg() allocate a temporary scanline from m_header.rgba_count but copy from it using m_header.pixel_bytes(), whose stride also includes z-buffer bytes. the oversized memcpy reads beyond the temporary heap buffer and copies adjacent memory into the output image, resulting in a crash or disclosure of adjacent heap data. The affected implementation is identified by src/iff.imageio/iffinput.cpp, IffInput::readimg(), m_header.rgba_count, and m_header.pixel_bytes(), which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.",
"evidence": "osv:UBUNTU-CVE-2026-59956",
"products": [
{
"name": {
"value": "openimageio",
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},
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{
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{
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{
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{
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{
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
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{
"value": "2.2.18.0+dfsg-1",
"evidence": "/affected/3/versions"
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{
"value": "2.2.18.0+dfsg-1build2",
"evidence": "/affected/3/versions"
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{
"value": "2.2.18.0+dfsg-1ubuntu2",
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{
"name": {
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"evidence": "/affected/4/package/name"
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"affected_versions": [
{
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{
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{
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{
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{
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{
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{
"name": {
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"evidence": "/affected/5/package/name"
},
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"affected_versions": [
{
"value": "2.5.19.1+dfsg-2",
"evidence": "/affected/5/versions"
},
{
"value": "2.5.19.1+dfsg-2build1",
"evidence": "/affected/5/versions"
},
{
"value": "2.5.19.1+dfsg-2build2",
"evidence": "/affected/5/versions"
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"name": {
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{
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{
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"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-59956",
"aliases": [
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"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H"
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{
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},
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59956.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libopenimageio2.5",
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},
{
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],
"modified": "2026-10-17T12:56:00.358275006Z",
"provider": "osv",
"upstream": [
"CVE-2026-59956"
],
"references": [
"https://ubuntu.com/security/CVE-2026-59956",
"https://www.cve.org/CVERecord?id=CVE-2026-59956",
"https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-hjfv-gvxc-qgvh",
"https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5251",
"https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/f01bd16764b2a06f372899e3e302280a7f9c8c02",
"https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.0.20.0",
"https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.15.0"
]
},
"related_cves": [
{
"value": "CVE-2026-59956",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354526,
"published_at": "2026-09-18T16:17:00+00:00"
}