Out of Bounds Memory Read/Write in libjxl

There exists an out of bounds read/write in LibJXL versions prior to commit 9cc451b91b74ba470fd72bd48c121e9f33d24c99. The JPEG decoder used by the JPEG XL encoder when doing JPEG recompression (i.e. if using JxlEncoderAddJPEGFrame on untrusted input) does not properly check bounds in the presence of incomplete codes. This could lead to an out-of-bounds write. In jpegli which is released as part of the same project, the same vulnerability is present. However, the relevant buffer is part of a bigger structure, and the code makes no assumptions on the values that could be overwritten. The issue could however cause jpegli to read uninitialised memory, or addresses of functions.

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跨界内存写

LibJXL 安全漏洞

LibJXL是LibJXL开源的一个PEG XL（编码器和解码器）的参考实现。 LibJXL存在安全漏洞，该漏洞源于JPEG解码器在处理JPEG重新压缩时对边界检查不当，在遇到不完整代码的情况下可能导致越界写入。

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