RUSTSEC-2026-0398

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0398

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0398.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0398

Published

2026-10-16T12:00:00Z

Modified

2026-10-26T14:00:05Z

Summary

`Seekable::decompress` sets a `Vec` length beyond its capacity for offsets past the end

Details

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.

Database specific

{
    "license":  "CC0-1.0"
}

References

Affected packages

crates.io / zstd-safe

Package

Name: zstd-safe; View open source insights on deps.dev
Purl: pkg:cargo/zstd-safe

Affected ranges

Type: SEMVER
Events: Introduced

7.2.2

Fixed

8.2.0

Ecosystem specific

{
    "affected_functions":  null,
    "affects":  {
        "arch":  [],
        "functions":  [
            "zstd_safe::seekable::AdvancedSeekable::decompress",
            "zstd_safe::seekable::Seekable::decompress"
        ],
        "os":  []
    }
}