RUSTSEC-2026-0348

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0348

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0348.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0348

Aliases

GHSA-h2v8-394m-p7vv

Published

2026-10-14T12:00:00Z

Modified

2026-10-14T13:30:02Z

Severity

3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Summary

Brotli certificate decompression can allocate up to 1 GiB before authentication

Details

The built-in Brotli certificate decompressor (enabled by the non-default brotli crate feature) bounded the size of the decompressed output, but accepted a peer-selected history window. Brotli's large-window extension was enabled, so a five-byte header could cause an allocation of 1 GiB. A peer can abort a process whose allocator cannot satisfy that request.

No trusted certificate is required by the attacker. Affected configurations are:

clients that enable the brotli feature and connect to a malicious server, and
servers that enable the brotli feature and request client certificates.

Applications that do not enable the brotli feature are not affected.

Database specific

{
    "license":  "CC0-1.0"
}

References

Affected packages

crates.io / rustls

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

0.23.9

Fixed

0.23.46

Ecosystem specific

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