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The vulnerability in the webp crate arises due to insufficient input validation within the `webp::Encoder::encode()` function. The encoder fails to verify that the provided input buffer slice has a sufficient length for the specified image width, height, and color format. When an application passes a buffer that is too small, the library’s encoding process will read beyond the allocated memory bounds of that buffer. This out-of-bounds read operation accesses adjacent memory contents that were not intended to be part of the image data. These unintended memory bytes are then processed and encoded into the output WebP image file. Consequently, the generated image file may contain fragments of sensitive data from the application’s memory space, such as cryptographic keys, passwords, or other private information, leading to a memory exposure vulnerability. Alternatively, if the out-of-bounds read attempts to access unmapped memory, it can trigger a segmentation fault and crash the application.
Platform: Rust Crate
Version: < 44
Vulnerability: Memory Exposure
Severity: Moderate
date: 2025-08-29
Prediction: Patch: 2025-09-05
What Undercode Say:
`./target/release/my_app –encode-image small_buffer.bin`
`strings output.webp | grep -i “secret”`
`valgrind ./target/release/my_app`
How Exploit:
Craft small input buffer.
Encode with large dimensions.
Analyze output WebP.
Protection from this CVE
Update to patched version.
Validate input buffer size.
Use fuzz testing.
Impact:
Memory disclosure.
Segmentation fault.
Information leak.
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Sources:
Reported By: github.com
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