RUSTSEC-2026-0401

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0401

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0401.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0401

Published

2026-10-16T12:00:00Z

Modified

2026-10-26T14:00:04Z

Summary

Out-of-bounds read in `train_from_buffer` when sample sizes overflow

Details

ZDICT_trainFromBuffer is never told the length of the samples buffer, so train_from_buffer checked that the sample sizes add up to it. With overflow checks off, as in release builds, that sum wrapped around: sizes totalling 2^64 plus the buffer length passed the check, and the trainer read past the end of the buffer. zstd::dict::from_continuous relies on this check from zstd 0.4.10; older versions of zstd had their own, covered by a separate advisory.

This requires the sample sizes to come from an untrusted source. The flaw was corrected by summing the sizes with overflow checks.

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

0.0.0-0

Fixed

8.2.0

Ecosystem specific

{
    "affected_functions":  null,
    "affects":  {
        "arch":  [],
        "functions":  [
            "zstd_safe::train_from_buffer"
        ],
        "os":  []
    }
}