RUSTSEC-2026-0398
`Seekable::decompress` sets a `Vec` length beyond its capacity for offsets past the end
ZSTD_seekable_decompress shortens the requested length to the end of the
data without checking that the offset is before it. For an offset past the
end, it returns a wrapped-around length without writing anything, and
Seekable::decompress passed that length to Vec::set_len.
With the seekable feature, whoever supplies the archive, or chooses the
offset, can leave the caller's Vec<u8> with a length far beyond its
capacity. Reading it then discloses neighbouring heap memory, and appending
to it corrupts memory. Offsets near u64::MAX can also hang the call.
The flaw was corrected by clamping requests to the end of the data, and by checking every count reported by the C library against the buffer capacity.
What each source reports
OSV No score
`Seekable::decompress` sets a `Vec` length beyond its capacity for offsets past the end
ZSTD_seekable_decompress shortens the requested length to the end of the
data without checking that the offset is before it. For an offset past the
end, it returns a wrapped-around length without writing anything, and
Seekable::decompress passed that length to Vec::set_len.
With the seekable feature, whoever supplies the archive, or chooses the
offset, can leave the caller's Vec<u8> with a length far beyond its
capacity. Reading it then discloses neighbouring heap memory, and appending
to it corrupts memory. Offsets near u64::MAX can also hang the call.
The flaw was corrected by clamping requests to the end of the data, and by checking every count reported by the C library against the buffer capacity.
- Record
RUSTSEC-2026-0398- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
zstd-safecrates.io |
7.2.2 up to 7.4.0, 8.0.0-0 up to 8.2.0 | 7.4.08.2.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
RUSTSEC-2026-0398 is a vulnerability with no CVSS score yet in zstd-safe, published October 16, 2026. No source lists public exploit code. Fixed in zstd-safe 7.4.0.