RUSTSEC-2026-0391

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0391

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0391.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0391

Published

2026-10-16T12:00:00Z

Modified

2026-10-26T14:00:04Z

Summary

Data from an abandoned stream leaks into the next stream on a reused context

Details

The with_context constructors of the stream encoders and decoders used the borrowed context as it was. When a stream was abandoned on a context, for example an encoder dropped before finish() after an error, whatever it left there was carried into the next stream: the input buffered by the previous encoder (up to 128 KiB, or all of it with zstdmt) became the start of the next frame, and a decoder returned undelivered output of the previous stream.

An application reusing one context for data that must stay separate, such as different users' requests, could disclose one user's plaintext to another. Whoever supplies the data can cause the abandonment with invalid input.

The flaw was corrected by resetting the context's session in with_context.

Database specific

{
    "license":  "CC0-1.0"
}

References

Affected packages

crates.io / zstd

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

0.13.2

Fixed

0.14.3

Ecosystem specific

{
    "affected_functions":  null,
    "affects":  {
        "arch":  [],
        "functions":  [
            "zstd::stream::raw::Decoder::with_context",
            "zstd::stream::raw::Encoder::with_context"
        ],
        "os":  []
    }
}