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Vulnerabilities

Security incident · RUSTSEC-2026-0387

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

Published Oct 23, 2026 · RustSec Rust

Last checked Oct 24, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for RUSTSEC-2026-0387. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.

Same product and reporting

Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Not established
Affected products
RustSec Rust

## Summary Several operations intended to be constant-time could execute secret-dependent branches, depending on the compiler and target CPU. These include subtraction, zero counting, division, and Montgomery multiplication. Additionally, equality could terminate at the first unequal limb, and branched on whether an inverse exists. ## Impact Applications using affected operations on secret integers may leak information through timing or microarchitectural side channels. This includes information about intermediate arithmetic values, matching limbs, and invertibility. Such leakage could potenti

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix RUSTSEC-2026-0387

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the rustsec record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for RUSTSEC-2026-0387. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 23, 2026 · RustSec Advisory DB

    Detected

    ## Summary Several operations intended to be constant-time could execute secret-dependent branches, depending on the compiler and target CPU. These include subtraction, zero counting, division, and Montgomery multiplication. Additionally, equality could terminate at the first unequal limb, and branched on whether an inverse exists. ## Impact Applications using affected operations on secret integer

Sources

  • RustSec Advisory DBVendor advisoryRUSTSEC-2026-0387

    ## Summary Several operations intended to be constant-time could execute secret-dependent branches, depending on the compiler and target CPU. These include subtraction, zero counting, division, and Montgomery multiplication. Additionally, equality could terminate at the first une

    crates.io

Freshness

Last verified in this catalog Unknown date. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • RustSec Advisory DBOct 24, 2026