Zstd safe: `Seekable` reads a NULL or out-of-bounds seek table
Affects zstd-safeSource GCVE Database
Rated by Threat Radar
- Patch
- Available – fixed in 8.2.0
Data as of 26 Oct 2026, 16:13 UTC
What to do
Upgrade zstd-safe to 8.2.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
crates.iozstd-safepkg:cargo/zstd-safeOther threats | Affected
| Fixed in
|
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Description
`Seekable` did not record whether it was initialized. On a fresh `Seekable`, or one whose `init_buff()` failed, `decompress`, `offset_to_frame_index` and `frame_decompressed_size` made the C library read a NULL seek table. After a failed re-initialization, `decompress` returned data from the refused buffer using the previous seek table. Separately, `frame_decompressed_size(num_frames())`, on `Seekable` and `SeekTable`, read one entry past the end of the seek table. The flaw was corrected by refusing to use a `Seekable` until an initialization succeeded, and by checking the frame index.