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Advisory record · RUSTSEC-2026-0387

Multiple timing variability issues in operations intended to be constant-time

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
crypto-bigintcrates.io>=0.0.0-0, <0.7.60.7.6
Identifiers
RUSTSEC-2026-0387
Published
23 Oct 2026
Updated
24 Oct 2026

Machine-written summary

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

crypto-bigint versions before 0.7.6 have several operations meant to run in constant time that may execute secret-dependent branches, depending on compiler and target CPU. These include subtraction, zero counting, division, Montgomery multiplication, UintRef equality, and BoxedMontyForm::invert. An attacker able to observe timing or microarchitectural side channels could potentially learn information about secret intermediate values or invertibility, which could in some cases help recover cryptographic secrets. Upgrade to crypto-bigint 0.7.6 or later, which removes the affected branches.

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.