OpenEXR CVE-2026-26981 Heap-buffer-overflow via signed integer underflow

Thinking Process: 1. Analyze the Request: Role: Professional translator specializing in cybersecurity. Task: Translate a Chinese vulnerability intelligence summary to English. Constraints: Maintain all Markdown formatting intact. Do not add any introductory or concluding remarks. Just output the English translation. Input: A Markdown-formatted text describing a vulnerability (CVE-2026-26981), including overview, affected versions, core issue (with code snippets), equivalent fix, risk impact, and demonstration/logs. 2. Analyze the Input Text: Title: (Key Information Summary) Section 1: (Vulnerability Overview) Fields: Vulnerability Type, Affected File, Function, CVE ID. Section 2: (Affected Versions and Fixed Versions) Fields: Affected Versions, Fixed Versions. Section 3: (Core Issue) Code snippet 1 (Vulnerable code). Explanation bullet point. Note: There is some garbled text in the original Chinese: . This looks like OCR error or copy-paste error in the source text. It seems to be trying to say something about and (or similar variables). Looking at the code , the explanation likely refers to and (or in the fix). The text says which is Arabic mixed with English? "السجل" means "register/log". This is likely corrupted text. I need to interpret the intent based on the context of the vulnerability (signed integer underflow). The context says "unsigned, calculation SZ - Z_z occurs negative number conversion to unsigned". I should translate the meaning accurately while noting the corruption if necessary, but as a professional translator, I should probably correct obvious typos to make sense in English or translate the intended meaning. However, strict translation might require keeping the error. Given the instruction "specializing in cybersecurity", accuracy is key. The text is nonsensical. It likely meant and (or similar). Let's look at the code: . The explanation says . This looks like LaTeX math that got corrupted. The core meaning is: and are unsigned, calculation results in negative, wraps around to huge unsigned number. I will translate the intent clearly rather than the garbled characters, as a professional translator would fix obvious source errors for clarity in a technical report, or translate the garbled part as is? Usually, for vulnerability reports, clarity is paramount. I will interpret the technical meaning: "sz and nend are unsigned...". Wait, looking closely at . It might be a copy-paste artifact from a different document. I will translate the logic described: "sz and nend are unsigned, calculation...". Actually, looking at the code and . The text says . I will translate the explanatory text based on the technical context provided in the code and the rest of the sentence ("导致数值极大化"). Decision: I will translate the technical meaning accurately. The garbled text seems to be a corruption of variable names. I will refer to the variables mentioned in the code ( , / ). Section 4: (Equivalent Fix) Code snippet 2 (Fixed code). Explanation. Section 5: (Impact Risk) Bullet points about crash and memory safety. Section 6: (Demonstration and Error Logs) Description of PoC and ASAN logs. 3. Drafting the Translation: -> -> -> -> -> -> -> -> -> -> Code block 1: Keep as is (it's code). <SZ والسجل.Servlet_large SZ - $\mathrm{Z}_{\mathrm{z}}$ memcpy Correction/Interpretation: The text is clearly corrupted. Based on the code , it likely refers to and (or ). The math likely refers to . Translation Strategy: Translate the meaning accurately for a professional report. "The variables and are unsigned. During the calculation , a negative number is converted to unsigned, causing the value to become extremely large, resulting in a out-of-bounds issue." Wait, strict translation vs. professional translation: As a "professional translator specializing in cybersecurity", my job is to ensure the intelligence is usable. Translating garbage characters is not helpful. I will infer the intended variable names based on the context ( , / ). Refined Translation: sz nend sz - nend memcpy 等效修复: Equivalent Fix: - 这将保证 值为目标数据长度，避免越界。 - This ensures that the value represents the target data length, avoiding out-of-bounds access. 影响风险 Impact Risk - 应用发生崩溃: 可以轻易利用上述代码片段通过构造特定的 EXR 文件来触发这类漏洞。 - Application Crash: The vulnerability can be easily triggered by constructing specific EXR files to exploit the code snippet above. - 内存安全风险: Heap-Buffer-Overflow 可能导致内存泄露、数据损坏等安全性问题。 - Memory Safety Risk: Heap-Buffer-Overflow may lead to security issues such as memory leaks, data corruption, etc. 演示与报错日志 Demonstration and Error Logs - 提供了 Test Case (PoC Input) 和 AddressSanitizer 日志，分别展示了漏洞触发的步骤与详细信息: - Provides Test Case (PoC Input) and AddressSanitizer logs, demonstrating the steps and detailed information of vulnerability triggering: - 地址越界访问时的日志输出 - Log output during out-of-bounds address access - 崩溃点的位置 (具体函数及其调用堆栈等)。 - Location of the crash point (specific function and its call stack, etc.). - . Inline code: ` ` sz nend sz - nend memcpy sz` value

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OpenEXR CVE-2026-26981 Heap-buffer-overflow via signed integer underflow

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