Critical Vulnerability Information Vulnerability Description Vulnerability Name: Silent Data Corruption in Bitstream Writer (Trust Boundary Violation) Target: Rust library's method File/Function: - Tested Version: Tested Commit: Affected Range: Environment: Kali Linux - Rustc Version: - Cargo Version: Vulnerability Impact CWE ID: - CWE-20: Improper Input Validation - CWE-682: Incorrect Calculation CVSS v3.1 Score (Proposed): - Automated Processing: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N ≈ 7.5 (High) - Manual Upload: AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N ≈ 6.8 (Medium-High) Brief Summary (TL;DR) Untrusted byte length ( ) — typically derived from user-controlled input such as filenames or EXIF metadata — is passed to the method without boundary checks. When is large (e.g., ), the internal state of the bitstream writer becomes inconsistent, leading to silent and persistent data corruption in the output stream. Why This Vulnerability Matters Poisoning Downstream Data: By submitting a specially crafted media file whose name or metadata encodes a large . Generating Invalid Bytes: Systems using the vulnerable writer silently generate invalid bytes, while still appearing to operate "normally". Consequences: Corrupting archives, polluting analysis/ML inputs, bypassing content filters based on correctly derived output, etc. Reproduction Environment Set up Rust environment Clone target repository Test script: and show actual output observed on Kali Linux. Remediation Recommendation proposes boundary checks and iteration logic fixes for the method. Evidence and Logs Evidence collection script: Input files: and generate output files and to demonstrate byte differences. Quick-run script: