RUSTSEC-2026-0212

See a problem?
Please try reporting it to the source first.

Source

https://rustsec.org/advisories/RUSTSEC-2026-0212

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0212.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0212

Published

2026-05-26T12:00:00Z

Modified

2026-07-17T11:45:03.712828005Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Potentially Incorrect Output of Constant-Time Swap/Select on Aarch64

Details

The implementation of constant-time swap and select on aarch64 platforms used a cmp instruction in inline assembly to check whether an 8-bit wide selector was 0. The cmp instruction works on 32-bit registers, which included the unspecified high 24 bits of the cmp operand. Depending on the execution environment the cmp could thus potentially return an incorrect result because its operand's high bits in the inline assembly were set when Rust expected them to be unset. This could lead to incorrect results for the constant-time swap and select operations built from this comparison.

Impact

In certain circumstances the swap and select instructions on aarch64 platforms returned incorrect results.

Mitigation

Starting from version 0.0.6, the selector is compared using a tst instruction with a mask, which only compares the first 8 bits of the selector.

Database specific

{
    "license": "CC0-1.0"
}

References

Affected packages

crates.io / libcrux-secrets

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Fixed

0.0.6

Ecosystem specific

{
    "affected_functions": null,
    "affects": {
        "os": [],
        "functions": [
            "libcrux_secrets::Select::select",
            "libcrux_secrets::Swap::swap"
        ],
        "arch": []
    }
}

Database specific

informational

null

source

"https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0212.json"