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Summary
vulnerability in openexr (CVE-2026-42216). Confidential information can be exposed externally. Exploitable via ``c13e0e1320a6652e02c5c90c6dbd984d532efe44``.
AI summary openai / gpt-4o
A critical flaw was discovered in OpenEXR, a software used for handling image formats. This flaw allows attackers to illicitly view data from memory or cause a system crash by manipulating certain files. Similar defects have previously led to exploited attacks in enterprise systems, particularly affecting the film industry. Updating to the recommended versions immediately can mitigate the risks.
The bug in the IDManifest::init() function occurs in OpenEXR versions 3.0.0 to 3.4.10. It lacks length checks for stringList[i][0] and stringList[i][1], allowing out-of-bounds reads, particularly problematic with strings over 255 bytes. The issue is resolved in versions 3.2.9, 3.3.11, and 3.4.11. Attackers can exploit this flaw to leak data from heap memory or cause DOS. No workaround is provided, so upgrading is critical.
❓ What is the problem
The vulnerability is in the IDManifest::init() function of OpenEXR, which reconstructs strings from a prefix-compressed representation without proper length checks.
📍 Affected scope
The issue is in `src/lib/OpenEXR/ImfIDManifest.cpp` on lines 342-343 and 346-347.
🔥 Severity
The vulnerability allows for remote exploitation without authentication or user interaction, leading to information disclosure or denial of service, classified as critical with a CVSS score of 9.1.
🔧 How to fix
Upgrade OpenEXR to versions 3.2.9, 3.3.11, or 3.4.11.
🛡️ Workaround
No workaround is provided in the sources.
🔍 Detection
Monitor for unusual memory access patterns when processing EXR files, especially those exceeding 255 bytes in length.
Related past incidents Similar incidents extracted from past CVEs
A buffer overflow in OpenEXR's PyBufImage::read() function could also lead to memory disruptions.
Another OpenEXR out-of-bounds read allowed similar heap memory exposure.
This vulnerability also involved an out-of-bounds read, resulting in critical data exposure.
If this happens at your company Expected impact per business scenario
📌 An animation studio using OpenEXR files for rendering.
An attacker could crash the rendering system, delaying production timelines.
📌 A VFX company with a large archive of EXR files.
If exploited, data leaks could reveal proprietary image content.
📌 A cloud service provider hosting EXR files.
Potential for DOS attacks against the hosting service, impacting multiple clients.
Recommended action
Implement the patches as soon as possible by updating to the fixed OpenEXR versions to mitigate the vulnerabilities.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'openexr' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `openexr` を grep し、稼働しているサービス・バージョンを把握する。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。