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CVE-2026-54334 is a heap out-of-bounds write in the native Tiano/EFI decompressor implementation used by the uefi-firmware parser. According to the provided advisory, the flaw is located in the ReadCLen function. A crafted firmware or compressed input processed by the parser can cause the decompressor to write beyond the bounds of a heap-allocated buffer, resulting in memory corruption during parsing.
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