| Title | luben zstd-jni 1.5.7-13 Cross-Object Use-After-Free |
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| Description | I was auditing the dictionary-sharing code path in zstd-jni and noticed that ZstdCompressCtx.loadDict(ZstdDictCompress dict) hands a raw native pointer to upstream zstd via ZSTD_CCtx_refCDict, but nothing tracks whether the dictionary object is still alive afterward. If the dictionary is close()d while a context that loaded it is still around, the next compress() call on that context dereferences freed native memory. I built the library from source and reproduced a real crash with a heap-spray. |
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| Source | ⚠️ https://github.com/luben/zstd-jni/issues/404 |
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| User | Yu Bao from PayPal Cyber Security Team (UID 99838) |
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| Submission | 08/13/2026 07:25 (1 month ago) |
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| Moderation | 09/14/2026 07:37 (1 month later) |
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| Status | Accepted |
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| VulDB entry | 403407 [luben zstd-jni up to 1.5.7-13 Dictionary Sharing ZstdCompressCtx.java ZstdCompressCtx.loadDict use after free] |
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| Points | 20 |
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