RUSTSEC-2026-0395

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0395

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0395.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0395

Published

2026-10-16T12:00:00Z

Modified

2026-10-26T14:00:06Z

Summary

Use-after-free with `CParameter::StableInBuffer`

Details

With CParameter::StableInBuffer(true) (experimental feature), the C library keeps a pointer to the input of one streaming call and reads from it in later calls, including flush_stream and end_stream, which take no input. An InBuffer only borrows its slice for one call, so safe code could free it in between, and freed memory was compressed into the frame. The C library behaves this way since zstd 1.5.4, whether bundled or linked from the system.

The flaw was corrected by refusing to enable the parameter.

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

4.1.0

Fixed

8.2.0

Ecosystem specific

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