Timing Attack Affecting cmov package, versions <0.4.4
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-CMOV-15032760
- published18 Jan 2026
- disclosed15 Jan 2026
- creditNicsTr
Introduced: 15 Jan 2026
NewCVE-2026-23519 (opens in a new tab)How to fix?
Upgrade cmov to version 0.4.4 or higher.
Overview
Affected versions of this package are vulnerable to Timing Attack via the cmovnz function when compiled for the thumbv6m-none-eabi target, which results in non-constant time assembly being emitted. An attacker can potentially infer sensitive information by performing timing analysis on the affected process.
PoC
#![no_std]
use cmov::Cmov;
#[inline(never)]
pub fn test_ct_cmov(a: &mut u8, b: u8, c: u8) {
a.cmovnz(&b, c);
}