| 标题 | Blosc c-blosc2 >= 2.0.0, < fix commit fe2964d114d9 Memory Corruption |
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| 描述 | Heap out-of-bounds write in blosclz_decompress() (blosc/blosclz.c:734) of Blosc c-blosc2, 2.0.0 (2020) through 3.3.2, 32-bit builds only. The bounds check "op + len > op_limit" is pointer arithmetic that wraps modulo 2^32: a crafted chunk extends match length len to ~255 MB via an unbounded extension loop, op + len wraps past 4 GiB, the guard passes, and copy_match() writes ~255 MB into a 64 KB block. One blosc2_decompress() call on a malicious chunk gives an attacker-controlled-length heap overwrite — SIGSEGV/DoS at minimum, potential code execution. 64-bit unaffected. Fixed in fe2964d114d97847f56570a0ab2be2c57ccbeedc (2026-08-31); the issue and fix have been acknowledged and credited by the maintainer in the commit message. |
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| 来源 | ⚠️ https://github.com/Blosc/c-blosc2/commit/fe2964d114d97847f56570a0ab2be2c57ccbeedc |
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| 用户 | zzxzzb (UID 95450) |
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| 提交 | 2026-09-01 08時26分 (30 日前) |
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| 管理 | 2026-09-30 09時25分 (29 days later) |
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| 状态 | 已接受 |
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| VulDB条目 | 411905 [Blosc C-Blosc2 直到 3.3.2 blosclz Decompression blosc/blosclz.c blosclz_decompress 内存损坏] |
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| 积分 | 20 |
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