RUSTSEC-2026-0220

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0220

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0220.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0220

Published

2026-07-08T12:00:00Z

Modified

2026-07-30T19:15:04.025918010Z

Summary

Uint shift operations: incorrect overflow flags and truncated shift amounts

Details

Uint::overflowing_shl/overflowing_shr returned false-negative overflow flags. overflowing_shl missed bits shifted above BITS but within the top limb (non-limb-aligned widths such as U160), and limbs wholly discarded by shifts >= 64; overflowing_shr missed wholly discarded low limbs. Shifted values were correct; only the flag was wrong.

The wrong flag propagates: checked_shl/checked_shr return Some instead of None, strict_* fail to panic, and saturating_* return a wrapped value instead of saturating. The incorrect checked_shl result causes to_base_be (and string formatting) to loop forever on no-alloc builds for non-limb-aligned widths — a denial of service if formatting is reachable from untrusted input.

Separately, wrapping_shl/wrapping_shr on 64/128/256-bit types truncated the shift amount modulo 2^32, so shifts >= 2^32 returned an incorrectly wrapped value instead of zero; on 32-bit targets the generic path also truncated 64-bit shift amounts.

Callers using checked or saturating shift semantics on untrusted shift amounts may compute incorrect results.

Database specific

{
    "license": "CC0-1.0"
}

References

Affected packages

crates.io / ruint

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Fixed

1.20.0

Ecosystem specific

{
    "affected_functions": null,
    "affects": {
        "functions": [
            "ruint::Uint::checked_shl",
            "ruint::Uint::checked_shr",
            "ruint::Uint::overflowing_shl",
            "ruint::Uint::overflowing_shr",
            "ruint::Uint::saturating_shl",
            "ruint::Uint::saturating_shr",
            "ruint::Uint::wrapping_shl",
            "ruint::Uint::wrapping_shr"
        ],
        "arch": [],
        "os": []
    }
}