Timing Attack Affecting org.bouncycastle:bcprov-jdk15to18 package, versions [1.73,1.86)
Threat Intelligence
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-JAVA-ORGBOUNCYCASTLE-20536928
- published6 Oct 2026
- disclosed3 Oct 2026
- creditThe Robusta team
Introduced: 3 Oct 2026
NewCVE-2026-18040 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcprov-jdk15to18 to version 1.86 or higher.
Overview
org.bouncycastle:bcprov-jdk15to18 is a Java implementation of cryptographic algorithms.
Affected versions of this package are vulnerable to Timing Attack through the GF arithmetic and the fixed-weight support sampler in HQCEngine. An attacker can recover information about the HQC private key by observing cache behavior or decapsulation timing while the code processes secret inputs during encapsulation and decapsulation. The GF(2^8) arithmetic exposes operand-dependent table accesses, and the support sampler’s collision handling and secret-index writes leak information from the key material re-expanded on each decapsulation.