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Advisory record · RUSTSEC-2026-0385

Non-constant-time mask generation and `u128` comparisons

No CVSS score

Published by OSV at 23 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
ctutilscrates.io>=0.0.0-0, <0.4.40.4.4
Identifiers
RUSTSEC-2026-0385
Published
23 Oct 2026
Updated
23 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The ctutils crate, versions before 0.4.4, could generate branch instructions in its mask generation functions for unsigned integers on common platforms, and its u128 comparisons could generate branches on 32-bit targets. An attacker who can observe timing or other side channels while secret values are processed may be able to recover those secrets. Upgrade ctutils to 0.4.4 or later.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

No source has published a CVSS score for this record yet.

  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.